| Year | Count |
|---|---|
| 1957 | 5 |
| 1957 | 5 |
| 1967 | 14 |
| 1969 | 15 |
| 1970 | 23 |
| 1971 | 79 |
| 1972 | 88 |
| 1973 | 118 |
| 1974 | 189 |
| 1975 | 154 |
| 1976 | 129 |
| 1977 | 99 |
| 1978 | 126 |
| 1979 | 89 |
| 1979 | 5 |
| 1980 | 21 |
| 1981 | 6 |
| 1982 | 13 |
| 1984 | 7 |
| 1991 | 5 |
| 1992 | 7 |
| 1994 | 5 |
| 1996 | 6 |
| 1997 | 7 |
| 1998 | 5 |
| 1999 | 9 |
| 2000 | 7 |
| 2001 | 12 |
| 2002 | 15 |
| 2003 | 15 |
| 2004 | 13 |
| 2005 | 20 |
| 2006 | 20 |
| 2007 | 21 |
| 2008 | 5 |
| 2008 | 16 |
| 2009 | 24 |
| 2010 | 18 |
| 2011 | 19 |
| 2012 | 34 |
| 2013 | 24 |
| 2014 | 23 |
| 2015 | 28 |
| 2016 | 63 |
| 2017 | 72 |
| 2020 | 44 |
| 2022 | 48 |
| 2023 | 48 |
| 2024 | 52 |