| Effective Date | Year | Amount of Increase | 
               
               
                  
                  
                     
                     | December 1 | 1997 | 2.1 | 
                  
                     
                     | December 1 | 1996 | 2.9 | 
                  
                     
                     | March 1 | 1996 | 2.6 | 
                  
                     
                     | March 1 | 1995 | 2.8 | 
                  
                     
                     | March 1 | 1994 | 2.6 | 
                  
                     
                     |   | 1993 | 0.0 | 
                  
                     
                     | December 1 | 1992 | 3.0 | 
                  
                     
                     | December 1 | 1991 | 3.7 | 
                  
                     
                     | December 1 | 1990 | 5.4 | 
                  
                     
                     | December 1 | 1989 | 4.7 | 
                  
                     
                     | December 1 | 1988 | 4.0 | 
                  
                     
                     | December 1 | 1987 | 4.2 | 
                  
                     
                     | December 1 | 1986 | 1.3 | 
                  
                     
                     | December 1 | 1985 | 0.0 | 
                  
                     
                     | December 1 | 1984 | 3.5 | 
                  
                     
                     | April 1 | 1983 | 3.9 * | 
                  
                     
                     | March 1 | 1982 | 8.7 | 
                  
                     
                     | March 1 | 1981 | 4.4 | 
                  
                     
                     | September 1 | 1980 | 7.7 | 
                  
                     
                     | March 1 | 1980 | 6.0 | 
                  
                     
                     | September 1 | 1979 | 6.9 | 
                  
                     
                     | March 1 | 1979 | 3.9 | 
                  
                     
                     | September 1 | 1978 | 4.9 | 
                  
                     
                     | March 1 | 1978 | 2.4 | 
                  
                     
                     | September 1 | 1977 | 4.3 | 
                  
                     
                     | March 1 | 1977 | 4.8 | 
                  
                     
                     | March 1 | 1976 | 5.4 | 
                  
                     
                     | August 1 | 1975 | 5.1 | 
                  
                     
                     | January 1 | 1975 | 7.3 | 
                  
                     
                     | July 1 | 1974 | 6.3 | 
                  
                     
                     | January 1 | 1974 | 5.5 | 
                  
                     
                     | July 1 | 1973 | 6.1 | 
                  
                     
                     | July 1 | 1972 | 4.8 | 
                  
                     
                     | June 1 | 1971 | 4.5 | 
                  
                     
                     | August 1 | 1970 | 5.6 | 
                  
                     
                     | November 1 | 1969 | 5.0 | 
                  
                     
                     | March 1 | 1969 | 3.9 | 
                  
                     
                     | May 1 | 1968 | 3.9 | 
                  
                     
                     | January 1 | 1967 | 3.9 | 
               
            
          
         * 3.3 for non-disabled employee annuitants under age 62.