       
               1988   1994   
         
          1988   1   1991   11   
     1991   11   1994   12   
      1994   3   1994   12   
         1991   8   1991   11   
    1992   4   1993   6   
    1993   10   1994   12   

         
      1988  1   1990   9   
    1990   9   1993   3   
    1993   3   1994   12   
       1990   2   1991   5   
    1993   12   1994   12   

          
      1988   1   1992   11   
    1992   11   1994   12   
       1991   11   1994   1   
     1988   1   1994   12   

         
      1988   1   1990   9   
    1990   9   1994   12   
       1988   1   1988   4   
    1988   8   1994   12   
    1988   11   1990   9   
      1991   8   1994   12   

           
      1988   1   1989   11   
    1989   11   1991   4   
    1992   4   1992   11   
      1992   11   1994   12   
       1988   1   1993   10   
    1993   10   1994   12   

         
      1988   1   1989   11   
    1990   1   1991   5   
    1991   5   1992   5   
        1992   5   1994   12   
       1988   1   1989   11   
    1990   9   1993   10   
      1993   3   1994   12   

             
      1988   1   1989   6   
      1989   6   1991   7   
    1991   7   1993   3   
    1993   10   1994   12   
       1988   8   1992   4   
    1992   4   1994   12   
    1993   3   1994   12   

            
        1988   1   1990   3   
        1990   3   1992   4   
    1992   4   1993   12   
      1994   3   1994   12   
       1988   1   1989   10   
    1991   8   1994   2   
      1994   3   1994   8   
    1994   8   1994   12   

            
        1988   1   1989   6   
    1989   6   1994   12   
       1988   1   1989   6   
      1991   8   1994   12   
    1992   4   1993   4     

            
        1988   1   1989   11   
        1989   11   1994   8   
    1994   8  1994   12   
         1988   8   1993   3   
        1988   1   1989   11   
    1993   3   1994   12   

          
      1988   1   1990   9   
    1990   9   1992   3   
      1992   4   1994   3   
    1994   3   1994   12   
       1988   1   1992   10   
    1993   10   1994  10   
      1994   10   1994   12   
    1992   4   1993   4     

                 
 1988   1   1994   12   
           
           1988   1   1989   7   
      1989   7   1991   11   
      1991   11   1992   11   
      1992   11   1994   10   
    1994   10   1994   12   
          1988   1   1989   7   
      1988   1   1993   3   
      1990   2   1990   4   
    1990   3   1994   12   
    1993   10   1994   3   
        1993   3   1993   4   
      1994   1   1994   12   

            
       1988   1   1993   3    
      1993   3   1994   1   
    1994   2   1994   12   
        1988   1   1993   11   
    1994   8   1994   12   

             
         1988   1   1991   11   
    1991   11   1994   1   
    1994   1   1994   12   
        1988   1   1990   5   
      1989   2   1992   5   
      1990   9   1994   12   
    1991   5   1994   1   
      1992   5   1994   5     
      1993   3   1994   12   
      1994   3   1994   3   
    1991   3   1993   8   

              
       1988  1   1994   6   
      1994   8   1994   12   
        1988   1   1988   8   
    1988   1   1994   12   
    1990   2   1994   12   
      1990   9   1994   12   
    1990   9   1993   4   
      1991   7   1993   3   
    1993   10   1994   12   
    1994   8   1994   12      

               
      1988   1   1989   11   
    1989   11   1992   4   
    1992   4   1992   11   
      1992   11   1994   12   
        1988   1   1991   5   
    1990   3   1993   7   
    1992   11   1994   12   
    1993   10   1994   12   

             
       1988   1   1989   11   
    1989   11   1991   5   
      1991   5   1992   4   
      1992   4   1993   10   
      1993   10   1994   12   
          1988   1   1991   5   
    1990   3   1992   4   
    1990   11   1992   12      
    1992   4   1994   12   
      1992   4   1993   3   
    1993   3   1994   3   
    1994   3   1994   12   
    1994   1   1994   12   