| Year | Count |
|---|---|
| 1959 | 12 |
| 1963 | 12 |
| 1964 | 10 |
| 1966 | 16 |
| 1967 | 20 |
| 1968 | 29 |
| 1969 | 72 |
| 1970 | 83 |
| 1971 | 92 |
| 1972 | 108 |
| 1973 | 131 |
| 1974 | 107 |
| 1975 | 72 |
| 1976 | 142 |
| 1977 | 84 |
| 1978 | 100 |
| 1979 | 67 |
| 1980 | 61 |
| 1981 | 26 |
| 1982 | 20 |
| 1983 | 11 |
| 1984 | 22 |
| 1985 | 35 |
| 1986 | 20 |
| 1987 | 55 |
| 1988 | 29 |
| 1989 | 33 |
| 1990 | 42 |
| 1991 | 38 |
| 1992 | 56 |
| 1993 | 48 |
| 1994 | 5 |
| 1995 | 11 |
| 1996 | 30 |
| 1997 | 40 |
| 1998 | 25 |
| 1999 | 26 |
| 2000 | 5 |
| 2001 | 50 |
| 2003 | 5 |
| 2003 | 10 |
| 2005 | 10 |
| 2006 | 6 |
| 2007 | 5 |
| 2008 | 28 |
| 2009 | 22 |
| 2010 | 14 |
| 2011 | 20 |
| 2012 | 38 |
| 2013 | 5 |
| 2014 | 6 |
| 2015 | 10 |
| 2017 | 10 |
| 2019 | 16 |
| 2022 | 12 |