| Year | Count |
|---|---|
| 1945 | 5 |
| 1970 | 5 |
| 1979 | 10 |
| 1981 | 5 |
| 1982 | 5 |
| 1985 | 10 |
| 1986 | 5 |
| 1987 | 5 |
| 1988 | 5 |
| 1991 | 8 |
| 1991 | 6 |
| 1993 | 9 |
| 1994 | 5 |
| 1995 | 6 |
| 1996 | 23 |
| 1997 | 28 |
| 1998 | 45 |
| 1999 | 59 |
| 2000 | 61 |
| 2001 | 51 |
| 2002 | 41 |
| 2003 | 82 |
| 2004 | 316 |
| 2005 | 280 |
| 2006 | 259 |
| 2007 | 370 |
| 2008 | 311 |
| 2008 | 5 |
| 2009 | 220 |
| 2010 | 215 |
| 2011 | 168 |
| 2012 | 175 |
| 2013 | 183 |
| 2014 | 104 |
| 2015 | 138 |
| 2016 | 127 |
| 2017 | 150 |
| 2018 | 102 |
| 2019 | 99 |
| 2020 | 39 |
| 2021 | 75 |
| 2022 | 72 |
| 2023 | 58 |
| 2024 | 71 |