| Year | Count |
|---|---|
| 1964 | 92 |
| 1965 | 16 |
| 1966 | 10 |
| 1967 | 6 |
| 1969 | 5 |
| 1971 | 29 |
| 1972 | 5 |
| 1985 | 5 |
| 1990 | 5 |
| 1991 | 17 |
| 1992 | 10 |
| 1993 | 23 |
| 1996 | 11 |
| 1998 | 5 |
| 1999 | 10 |
| 2000 | 10 |
| 2001 | 12 |
| 2002 | 5 |
| 2004 | 26 |
| 2005 | 56 |
| 2006 | 89 |
| 2007 | 80 |
| 2008 | 189 |
| 2009 | 150 |
| 2010 | 120 |
| 2011 | 207 |
| 2012 | 177 |
| 2013 | 271 |
| 2014 | 323 |
| 2015 | 436 |
| 2016 | 527 |
| 2017 | 473 |
| 2018 | 496 |
| 2019 | 633 |
| 2020 | 593 |
| 2021 | 670 |
| 2022 | 542 |
| 2023 | 479 |
| 2024 | 467 |