| Year | Count |
|---|---|
| 1950 | 6 |
| 1951 | 15 |
| 1952 | 7 |
| 1953 | 6 |
| 1955 | 12 |
| 1956 | 10 |
| 1959 | 10 |
| 1960 | 10 |
| 1964 | 6 |
| 1965 | 5 |
| 1967 | 7 |
| 1969 | 5 |
| 1970 | 12 |
| 1971 | 18 |
| 1973 | 15 |
| 1974 | 12 |
| 1977 | 10 |
| 1982 | 6 |
| 1987 | 6 |
| 1989 | 7 |
| 1991 | 6 |
| 1993 | 5 |
| 1994 | 5 |
| 1995 | 5 |
| 1996 | 44 |
| 1997 | 90 |
| 1998 | 151 |
| 1999 | 109 |
| 2000 | 87 |
| 2001 | 184 |
| 2002 | 129 |
| 2003 | 205 |
| 2004 | 272 |
| 2005 | 268 |
| 2006 | 242 |
| 2007 | 278 |
| 2008 | 320 |
| 2009 | 327 |
| 2010 | 317 |
| 2011 | 350 |
| 2012 | 413 |
| 2013 | 449 |
| 2014 | 433 |
| 2015 | 560 |
| 2016 | 642 |
| 2017 | 787 |
| 2018 | 619 |
| 2019 | 662 |
| 2020 | 621 |
| 2021 | 643 |
| 2022 | 654 |
| 2023 | 786 |
| 2024 | 835 |