| Year | Count |
|---|---|
| 1967 | 62 |
| 1969 | 6 |
| 1973 | 5 |
| 1974 | 6 |
| 1975 | 8 |
| 1976 | 10 |
| 1977 | 10 |
| 1978 | 6 |
| 1979 | 10 |
| 1980 | 7 |
| 1984 | 5 |
| 1986 | 12 |
| 1990 | 12 |
| 1992 | 11 |
| 1993 | 40 |
| 1994 | 81 |
| 1995 | 41 |
| 1996 | 61 |
| 1997 | 77 |
| 1998 | 122 |
| 1999 | 67 |
| 2000 | 70 |
| 2001 | 113 |
| 2002 | 130 |
| 2003 | 130 |
| 2004 | 179 |
| 2005 | 209 |
| 2006 | 135 |
| 2007 | 129 |
| 2008 | 184 |
| 2009 | 92 |
| 2010 | 72 |
| 2011 | 141 |
| 2012 | 125 |
| 2013 | 69 |
| 2014 | 70 |
| 2015 | 54 |
| 2016 | 75 |
| 2017 | 95 |
| 2018 | 43 |
| 2019 | 45 |
| 2020 | 61 |
| 2021 | 41 |
| 2022 | 47 |
| 2023 | 62 |
| 2024 | 50 |