| Year | Count |
|---|---|
| 1914 | 6 |
| 1919 | 7 |
| 1920 | 5 |
| 1923 | 12 |
| 1967 | 5 |
| 1968 | 41 |
| 1969 | 54 |
| 1970 | 30 |
| 1971 | 19 |
| 1972 | 5 |
| 1973 | 5 |
| 1981 | 40 |
| 1982 | 35 |
| 1983 | 136 |
| 1984 | 133 |
| 1985 | 181 |
| 1986 | 133 |
| 1987 | 104 |
| 1988 | 132 |
| 1989 | 242 |
| 1990 | 366 |
| 1991 | 493 |
| 1992 | 529 |
| 1993 | 539 |
| 1994 | 497 |
| 1995 | 435 |
| 1996 | 381 |
| 1997 | 467 |
| 1998 | 413 |
| 1999 | 394 |
| 2000 | 439 |
| 2001 | 379 |
| 2002 | 367 |
| 2003 | 502 |
| 2004 | 462 |
| 2005 | 557 |
| 2006 | 373 |
| 2007 | 291 |
| 2008 | 354 |
| 2009 | 308 |
| 2010 | 330 |
| 2011 | 279 |
| 2012 | 206 |
| 2013 | 190 |
| 2014 | 151 |
| 2015 | 230 |
| 2016 | 162 |
| 2017 | 175 |
| 2018 | 138 |
| 2019 | 110 |
| 2020 | 144 |
| 2021 | 95 |
| 2022 | 48 |
| 2023 | 69 |
| 2024 | 65 |