| Year | Count |
|---|---|
| 1958 | 5 |
| 1960 | 5 |
| 1963 | 7 |
| 1964 | 5 |
| 1965 | 5 |
| 1967 | 314 |
| 1968 | 100 |
| 1969 | 56 |
| 1970 | 28 |
| 1971 | 37 |
| 1972 | 14 |
| 1973 | 50 |
| 1974 | 42 |
| 1975 | 70 |
| 1976 | 44 |
| 1977 | 66 |
| 1978 | 38 |
| 1979 | 38 |
| 1980 | 24 |
| 1981 | 59 |
| 1982 | 47 |
| 1983 | 52 |
| 1984 | 39 |
| 1985 | 71 |
| 1986 | 69 |
| 1987 | 35 |
| 1988 | 64 |
| 1989 | 30 |
| 1990 | 45 |
| 1991 | 38 |
| 1992 | 24 |
| 1993 | 35 |
| 1994 | 11 |
| 1995 | 34 |
| 1996 | 38 |
| 1997 | 42 |
| 1998 | 62 |
| 1999 | 44 |
| 2000 | 31 |
| 2001 | 32 |
| 2002 | 53 |
| 2003 | 31 |
| 2004 | 33 |
| 2005 | 35 |
| 2006 | 22 |
| 2007 | 51 |
| 2008 | 46 |
| 2009 | 30 |
| 2010 | 31 |
| 2011 | 14 |
| 2014 | 5 |
| 2015 | 5 |
| 2017 | 8 |
| 2020 | 10 |
| 2021 | 15 |
| 2022 | 5 |
| 2023 | 8 |
| 2024 | 34 |