| Year | Count |
|---|---|
| 1950 | 5 |
| 1952 | 8 |
| 1953 | 9 |
| 1955 | 9 |
| 1956 | 8 |
| 1957 | 26 |
| 1959 | 20 |
| 1960 | 30 |
| 1961 | 22 |
| 1962 | 10 |
| 1963 | 17 |
| 1964 | 10 |
| 1965 | 10 |
| 1966 | 14 |
| 1967 | 13 |
| 1968 | 13 |
| 1969 | 9 |
| 1970 | 9 |
| 1971 | 7 |
| 1972 | 8 |
| 1975 | 5 |
| 1976 | 10 |
| 1980 | 5 |
| 1982 | 12 |
| 1983 | 10 |
| 1984 | 6 |
| 1985 | 10 |
| 1986 | 18 |
| 1987 | 16 |
| 1988 | 26 |
| 1989 | 14 |
| 1990 | 16 |
| 1991 | 22 |
| 1992 | 36 |
| 1993 | 20 |
| 1994 | 14 |
| 1995 | 38 |
| 1996 | 40 |
| 1997 | 49 |
| 1998 | 41 |
| 1999 | 5 |
| 2000 | 47 |
| 2001 | 74 |
| 2002 | 28 |
| 2003 | 39 |
| 2004 | 80 |
| 2005 | 84 |
| 2006 | 66 |
| 2007 | 76 |
| 2008 | 70 |
| 2009 | 10 |
| 2010 | 32 |
| 2011 | 32 |
| 2012 | 18 |
| 2013 | 10 |
| 2014 | 15 |
| 2015 | 29 |
| 2017 | 15 |
| 2018 | 6 |
| 2019 | 6 |
| 2020 | 5 |
| 2022 | 6 |