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| YEAR | TOTAL |
| 1970* | 13,887 |
| 1971 | 15,380 |
| 1972 | 21,572 |
| 1973 | 24,660 |
| 1974 | 26,256 |
| 1975 | 26,892 |
| 1976 | 24,000 |
| 1977 | 24,548 |
| 1978 | 25,444 |
| 1979 | 26,544 |
| 1980 | 27,785 |
| 1981 | 28,917 |
| 1982 | 26,798 |
| 1983 | 26,138 |
| 1984 | 24,944 |
| 1985 | 23,948 |
| 1986 | 22,680 |
| 1987 | 18,450 |
| 1988 | 15,654 |
| 1989 | 18,068 |
| 1990 | 19,539 |
| 1991 | 19,652 |
| 1992 | 22,464 |
| 1993 | 21,391 |
| 1994 | 26,863 |
| 1995 | 30,575 |
| 1996 | 33,725 |
| 1997 | 38,842 |
| 1998 | 42,349 |
| 1999 | 46,512 |
| 2000 | 49,812 |
| 2001 | 52,602 |
| 2002 | 57,695 |
| 2003 | 68,819 |
| 2004 | 76,954 |
| 2005 | 80,957 |
| 2006 | 93,419 |
| 2007 | 78,027 |
| 2008 | 51,724 |
| 2009 | 26,420 |
| 2010 | 14,602 |
| 2011 | 10,480 |
| 2012 | 8,488 |
*Records began in 1970