| Year | Count |
|---|---|
| 1922 | 5 |
| 1930 | 5 |
| 1939 | 5 |
| 1953 | 6 |
| 1954 | 15 |
| 1955 | 6 |
| 1958 | 14 |
| 1959 | 12 |
| 1960 | 10 |
| 1962 | 21 |
| 1963 | 18 |
| 1967 | 12 |
| 1971 | 7 |
| 1972 | 6 |
| 1974 | 5 |
| 1979 | 5 |
| 1980 | 7 |
| 1981 | 5 |
| 1982 | 8 |
| 1985 | 5 |
| 1987 | 5 |
| 1988 | 5 |
| 1989 | 16 |
| 1994 | 12 |
| 1995 | 23 |
| 1996 | 27 |
| 1997 | 63 |
| 1998 | 254 |
| 1999 | 177 |
| 2000 | 116 |
| 2001 | 105 |
| 2002 | 116 |
| 2003 | 113 |
| 2004 | 198 |
| 2005 | 147 |
| 2006 | 217 |
| 2007 | 117 |
| 2008 | 129 |
| 2009 | 151 |
| 2010 | 135 |
| 2011 | 99 |
| 2012 | 102 |
| 2013 | 103 |
| 2014 | 90 |
| 2015 | 161 |
| 2016 | 93 |
| 2017 | 80 |
| 2018 | 45 |
| 2019 | 44 |
| 2020 | 50 |
| 2021 | 36 |
| 2022 | 35 |
| 2023 | 30 |
| 2024 | 43 |