| Year | Count |
|---|---|
| 1922 | 5 |
| 1925 | 5 |
| 1961 | 13 |
| 1963 | 6 |
| 1964 | 14 |
| 1965 | 18 |
| 1966 | 7 |
| 1967 | 6 |
| 1968 | 23 |
| 1969 | 16 |
| 1970 | 7 |
| 1971 | 26 |
| 1972 | 6 |
| 1973 | 28 |
| 1974 | 17 |
| 1978 | 5 |
| 1979 | 10 |
| 1980 | 12 |
| 1981 | 5 |
| 1984 | 16 |
| 1986 | 5 |
| 1989 | 6 |
| 1990 | 20 |
| 1991 | 10 |
| 1992 | 15 |
| 1993 | 5 |
| 1994 | 6 |
| 1995 | 10 |
| 1997 | 12 |
| 1998 | 7 |
| 1999 | 10 |
| 2000 | 15 |
| 2001 | 7 |
| 2002 | 12 |
| 2003 | 11 |
| 2004 | 11 |
| 2005 | 10 |
| 2006 | 23 |
| 2007 | 23 |
| 2008 | 43 |
| 2009 | 15 |
| 2010 | 38 |
| 2011 | 24 |
| 2012 | 58 |
| 2013 | 57 |
| 2014 | 63 |
| 2015 | 57 |
| 2016 | 29 |
| 2017 | 29 |
| 2018 | 29 |
| 2019 | 24 |
| 2020 | 27 |
| 2021 | 33 |
| 2022 | 37 |
| 2023 | 25 |