| Year | Count |
|---|---|
| 1918 | 16 |
| 1926 | 6 |
| 1972 | 17 |
| 1973 | 46 |
| 1974 | 194 |
| 1975 | 277 |
| 1976 | 237 |
| 1977 | 300 |
| 1978 | 185 |
| 1979 | 204 |
| 1980 | 202 |
| 1981 | 145 |
| 1982 | 73 |
| 1983 | 44 |
| 1984 | 25 |
| 1985 | 20 |
| 1986 | 10 |
| 1987 | 12 |
| 1989 | 5 |
| 1990 | 20 |
| 1995 | 18 |
| 1996 | 5 |
| 1997 | 12 |
| 1999 | 10 |
| 2000 | 7 |
| 2001 | 21 |
| 2002 | 17 |
| 2003 | 17 |
| 2004 | 47 |
| 2005 | 50 |
| 2006 | 5 |
| 2007 | 19 |
| 2008 | 40 |
| 2010 | 17 |
| 2011 | 5 |
| 2012 | 18 |
| 2013 | 6 |
| 2016 | 7 |
| 2017 | 8 |
| 2018 | 22 |
| 2019 | 5 |
| 2020 | 40 |
| 2021 | 20 |
| 2022 | 15 |
| 2023 | 12 |
| 2024 | 10 |