| Year | Count |
|---|---|
| 1954 | 5 |
| 1955 | 5 |
| 1956 | 10 |
| 1957 | 5 |
| 1959 | 5 |
| 1960 | 12 |
| 1961 | 9 |
| 1962 | 10 |
| 1968 | 6 |
| 1969 | 22 |
| 1970 | 10 |
| 1972 | 5 |
| 1973 | 11 |
| 1975 | 10 |
| 1977 | 11 |
| 1978 | 5 |
| 1980 | 36 |
| 1982 | 13 |
| 1983 | 11 |
| 1984 | 5 |
| 1986 | 5 |
| 1988 | 10 |
| 1989 | 13 |
| 1990 | 13 |
| 1991 | 17 |
| 1992 | 18 |
| 1993 | 27 |
| 1994 | 27 |
| 1995 | 30 |
| 1996 | 67 |
| 1997 | 53 |
| 1998 | 83 |
| 1999 | 61 |
| 2000 | 97 |
| 2001 | 178 |
| 2002 | 223 |
| 2003 | 290 |
| 2004 | 475 |
| 2005 | 565 |
| 2006 | 621 |
| 2007 | 699 |
| 2008 | 736 |
| 2009 | 559 |
| 2010 | 585 |
| 2011 | 565 |
| 2012 | 586 |
| 2013 | 445 |
| 2014 | 533 |
| 2015 | 623 |
| 2016 | 569 |
| 2017 | 662 |
| 2018 | 383 |
| 2019 | 456 |
| 2020 | 410 |
| 2021 | 398 |
| 2022 | 483 |
| 2023 | 444 |
| 2024 | 777 |