| Year | Count |
|---|---|
| 1959 | 18 |
| 1960 | 14 |
| 1962 | 5 |
| 1970 | 8 |
| 1974 | 5 |
| 1975 | 7 |
| 1976 | 9 |
| 1977 | 12 |
| 1978 | 20 |
| 1979 | 22 |
| 1980 | 38 |
| 1981 | 13 |
| 1982 | 15 |
| 1983 | 21 |
| 1984 | 14 |
| 1985 | 11 |
| 1986 | 20 |
| 1987 | 11 |
| 1988 | 19 |
| 1989 | 20 |
| 1990 | 27 |
| 1991 | 32 |
| 1992 | 25 |
| 1993 | 27 |
| 1994 | 26 |
| 1995 | 20 |
| 1996 | 30 |
| 1997 | 32 |
| 1998 | 31 |
| 1999 | 25 |
| 2000 | 33 |
| 2001 | 41 |
| 2002 | 37 |
| 2003 | 50 |
| 2004 | 35 |
| 2005 | 65 |
| 2006 | 57 |
| 2007 | 51 |
| 2008 | 67 |
| 2009 | 80 |
| 2010 | 71 |
| 2011 | 81 |
| 2012 | 71 |
| 2013 | 97 |
| 2014 | 118 |
| 2015 | 99 |
| 2016 | 240 |
| 2017 | 306 |
| 2018 | 279 |
| 2019 | 164 |
| 2020 | 152 |
| 2021 | 191 |
| 2022 | 160 |
| 2023 | 206 |
| 2024 | 209 |