| Year | Count |
|---|---|
| 1950 | 5 |
| 1952 | 10 |
| 1956 | 14 |
| 1957 | 5 |
| 1960 | 5 |
| 1962 | 10 |
| 1963 | 7 |
| 1965 | 10 |
| 1967 | 17 |
| 1968 | 19 |
| 1969 | 8 |
| 1970 | 6 |
| 1971 | 5 |
| 1974 | 5 |
| 1975 | 15 |
| 1976 | 8 |
| 1977 | 5 |
| 1979 | 5 |
| 1982 | 5 |
| 1983 | 12 |
| 1984 | 5 |
| 1987 | 9 |
| 1989 | 6 |
| 1990 | 6 |
| 1991 | 12 |
| 1992 | 22 |
| 1993 | 6 |
| 1994 | 8 |
| 1995 | 18 |
| 1996 | 22 |
| 1997 | 10 |
| 1998 | 14 |
| 1999 | 29 |
| 2000 | 25 |
| 2001 | 21 |
| 2002 | 5 |
| 2004 | 5 |
| 2005 | 18 |
| 2006 | 24 |
| 2007 | 25 |
| 2008 | 45 |
| 2009 | 12 |
| 2010 | 5 |
| 2011 | 16 |
| 2012 | 10 |
| 2013 | 14 |
| 2014 | 14 |
| 2016 | 38 |
| 2017 | 10 |
| 2019 | 5 |
| 2023 | 5 |