year | events 
------+--------
 1950 |  79594
 1951 |  84094
 1952 |  84455
 1953 |  88088
 1954 |  92247
 1955 |  91120
 1956 |  93297
 1957 |  94827
 1958 |  95663
 1959 |  96606
 1960 |  97347
 1961 | 112555
 1962 | 127704
 1963 | 125762
 1964 | 126295
 1965 | 125848
 1966 | 124775
 1967 | 124788
 1968 | 122799
 1969 | 153282
 1970 | 154299
 1971 | 150588
 1972 | 144465
 1973 | 153696
 1974 | 154583
 1975 | 154541
 1976 | 153958
 1977 | 168349
 1978 | 165700
 1979 | 166819
 1980 | 167918
 1981 | 110247
 1982 | 167766
 1983 | 167445
 1984 | 167027
 1985 | 166552
 1986 | 167746
 1987 | 169031
 1988 | 166512
 1989 | 166502
 1990 | 166911
 1991 | 167446
 1992 | 167240
 1993 | 181366
 1994 | 129304
 1995 | 162626
 1996 | 183693
 1997 | 182143
 1998 | 195011
 1999 | 196562
 2000 | 196406
 2001 | 193358
 2002 | 192489
 2003 | 193170
 2004 | 194194
 2005 | 191825
 2006 | 193823
 2007 | 194520
 2008 | 193492
 2009 | 193276
 2010 | 191835