1971     885 
   1972     951 
   1973     924 
   1974     759 
   1975     802 
   1976     975 
   1977     835 
   1978     805 
   1979     839 
   1980     964 
   1981     899
   1982    1047
   1983    1259
   1984    1212
   1985    1547
   1986    1896
   1987    2276
   1988    2061
   1989    2508
   1990    2679