| Year | Count |
|---|---|
| 1930 | 10 |
| 1937 | 5 |
| 1952 | 5 |
| 1955 | 5 |
| 1965 | 5 |
| 1970 | 7 |
| 1972 | 5 |
| 1973 | 7 |
| 1976 | 14 |
| 1978 | 20 |
| 1979 | 10 |
| 1983 | 7 |
| 1984 | 6 |
| 1985 | 20 |
| 1986 | 9 |
| 1987 | 12 |
| 1988 | 7 |
| 1989 | 14 |
| 1990 | 6 |
| 1991 | 19 |
| 1992 | 26 |
| 1993 | 14 |
| 1995 | 20 |
| 1996 | 18 |
| 1997 | 31 |
| 1998 | 36 |
| 1999 | 20 |
| 2000 | 46 |
| 2001 | 48 |
| 2002 | 21 |
| 2003 | 48 |
| 2004 | 69 |
| 2005 | 98 |
| 2006 | 109 |
| 2007 | 261 |
| 2008 | 313 |
| 2009 | 266 |
| 2010 | 320 |
| 2011 | 313 |
| 2012 | 308 |
| 2013 | 349 |
| 2014 | 395 |
| 2015 | 439 |
| 2016 | 547 |
| 2017 | 443 |
| 2018 | 383 |
| 2019 | 453 |
| 2020 | 451 |
| 2021 | 481 |
| 2022 | 586 |
| 2023 | 579 |
| 2024 | 687 |