| Year | Count |
|---|---|
| 1970 | 5 |
| 1971 | 12 |
| 1972 | 30 |
| 1975 | 14 |
| 1979 | 55 |
| 1980 | 38 |
| 1981 | 23 |
| 1983 | 10 |
| 1984 | 10 |
| 1985 | 5 |
| 1986 | 5 |
| 1987 | 14 |
| 1988 | 6 |
| 1989 | 57 |
| 1990 | 93 |
| 1991 | 104 |
| 1992 | 22 |
| 1993 | 33 |
| 1995 | 26 |
| 1996 | 16 |
| 1997 | 5 |
| 1998 | 17 |
| 2004 | 17 |
| 2005 | 31 |
| 2006 | 38 |
| 2007 | 55 |
| 2008 | 19 |
| 2009 | 44 |
| 2010 | 31 |
| 2011 | 17 |
| 2012 | 60 |
| 2014 | 17 |
| 2015 | 51 |
| 2016 | 24 |
| 2017 | 77 |
| 2018 | 65 |
| 2018 | 10 |
| 2019 | 50 |
| 2020 | 41 |
| 2021 | 31 |
| 2021 | 5 |
| 2022 | 61 |
| 2023 | 36 |
| 2024 | 41 |