| Year | Count |
|---|---|
| 1955 | 64 |
| 1956 | 49 |
| 1957 | 91 |
| 1958 | 45 |
| 1959 | 57 |
| 1960 | 62 |
| 1961 | 39 |
| 1962 | 28 |
| 1963 | 38 |
| 1964 | 21 |
| 1965 | 6 |
| 1966 | 5 |
| 1968 | 15 |
| 1971 | 5 |
| 1979 | 12 |
| 1981 | 12 |
| 1982 | 13 |
| 1983 | 6 |
| 1984 | 5 |
| 1985 | 11 |
| 1986 | 10 |
| 1987 | 17 |
| 1988 | 25 |
| 1989 | 18 |
| 1990 | 23 |
| 1991 | 12 |
| 1992 | 12 |
| 1993 | 26 |
| 1994 | 19 |
| 1995 | 14 |
| 1996 | 34 |
| 1997 | 17 |
| 1998 | 21 |
| 1999 | 46 |
| 2000 | 18 |
| 2001 | 41 |
| 2002 | 46 |
| 2003 | 23 |
| 2004 | 40 |
| 2005 | 48 |
| 2006 | 36 |
| 2007 | 46 |
| 2008 | 67 |
| 2009 | 28 |
| 2010 | 27 |
| 2011 | 34 |
| 2012 | 16 |
| 2013 | 18 |
| 2014 | 30 |
| 2016 | 17 |
| 2018 | 11 |
| 2021 | 6 |
| 2023 | 5 |
| 2024 | 6 |