| Year | Count |
|---|---|
| 1937 | 6 |
| 1939 | 7 |
| 1942 | 12 |
| 1950 | 9 |
| 1952 | 6 |
| 1958 | 12 |
| 1969 | 5 |
| 1970 | 5 |
| 1974 | 5 |
| 1976 | 12 |
| 1977 | 18 |
| 1978 | 14 |
| 1981 | 9 |
| 1982 | 8 |
| 1984 | 11 |
| 1985 | 11 |
| 1986 | 5 |
| 1987 | 7 |
| 1988 | 9 |
| 1989 | 10 |
| 1990 | 15 |
| 1991 | 14 |
| 1992 | 10 |
| 1993 | 7 |
| 1994 | 10 |
| 1995 | 13 |
| 1996 | 13 |
| 1997 | 14 |
| 1998 | 11 |
| 1999 | 18 |
| 2000 | 11 |
| 2001 | 19 |
| 2002 | 24 |
| 2003 | 20 |
| 2004 | 16 |
| 2005 | 19 |
| 2006 | 29 |
| 2007 | 26 |
| 2008 | 11 |
| 2009 | 27 |
| 2010 | 19 |
| 2011 | 18 |
| 2012 | 27 |
| 2013 | 23 |
| 2014 | 33 |
| 2015 | 44 |
| 2016 | 60 |
| 2017 | 67 |
| 2018 | 33 |
| 2019 | 71 |
| 2020 | 62 |
| 2021 | 63 |
| 2022 | 68 |
| 2023 | 115 |
| 2024 | 102 |