| Year | Count |
|---|---|
| 1949 | 8 |
| 1956 | 11 |
| 1957 | 12 |
| 1958 | 12 |
| 1959 | 15 |
| 1960 | 20 |
| 1961 | 8 |
| 1963 | 5 |
| 1964 | 10 |
| 1965 | 10 |
| 1966 | 5 |
| 1967 | 15 |
| 1971 | 5 |
| 1983 | 10 |
| 1984 | 7 |
| 1985 | 12 |
| 1986 | 5 |
| 1987 | 12 |
| 1988 | 10 |
| 1989 | 10 |
| 1990 | 25 |
| 1991 | 5 |
| 1992 | 27 |
| 1993 | 29 |
| 1994 | 26 |
| 1995 | 15 |
| 1996 | 18 |
| 1997 | 28 |
| 1998 | 60 |
| 1999 | 32 |
| 2000 | 40 |
| 2001 | 85 |
| 2002 | 62 |
| 2003 | 39 |
| 2004 | 130 |
| 2005 | 191 |
| 2006 | 276 |
| 2007 | 224 |
| 2008 | 202 |
| 2009 | 145 |
| 2010 | 144 |
| 2011 | 150 |
| 2012 | 130 |
| 2013 | 140 |
| 2014 | 121 |
| 2015 | 152 |
| 2016 | 230 |
| 2017 | 268 |
| 2018 | 202 |
| 2019 | 288 |
| 2020 | 251 |
| 2021 | 318 |
| 2022 | 367 |
| 2023 | 354 |
| 2024 | 373 |