| Year | Count |
|---|---|
| 1966 | 589 |
| 1967 | 725 |
| 1968 | 862 |
| 1969 | 769 |
| 1970 | 720 |
| 1971 | 664 |
| 1972 | 577 |
| 1973 | 580 |
| 1974 | 508 |
| 1975 | 583 |
| 1976 | 762 |
| 1977 | 653 |
| 1978 | 590 |
| 1979 | 712 |
| 1980 | 849 |
| 1981 | 759 |
| 1982 | 923 |
| 1983 | 988 |
| 1984 | 1,009 |
| 1985 | 1,118 |
| 1986 | 915 |
| 1987 | 858 |
| 1988 | 925 |
| 1989 | 725 |
| 1990 | 682 |
| 1991 | 665 |
| 1992 | 415 |
| 1993 | 377 |
| 1994 | 388 |
| 1995 | 254 |
| 1996 | 220 |
| 1997 | 192 |
| 1998 | 167 |
| 1999 | 105 |
| 2000 | 118 |
| 2001 | 40 |
| 2002 | 46 |
| 2003 | 40 |
| 2004 | 37 |
| 2005 | 35 |
| 2006 | 32 |
| 2007 | 23 |
| 2008 | 15 |
| 2010 | 9 |
| 2012 | 12 |
| 2013 | 9 |