| Year | Count |
|---|---|
| 1971 | 5 |
| 1976 | 10 |
| 1978 | 10 |
| 1980 | 10 |
| 1981 | 7 |
| 1982 | 10 |
| 1983 | 19 |
| 1984 | 5 |
| 1985 | 20 |
| 1986 | 34 |
| 1987 | 82 |
| 1988 | 49 |
| 1989 | 71 |
| 1990 | 26 |
| 1991 | 67 |
| 1992 | 118 |
| 1993 | 106 |
| 1994 | 96 |
| 1995 | 68 |
| 1996 | 81 |
| 1997 | 131 |
| 1998 | 106 |
| 1999 | 53 |
| 2000 | 90 |
| 2001 | 112 |
| 2002 | 104 |
| 2003 | 143 |
| 2004 | 341 |
| 2005 | 255 |
| 2006 | 265 |
| 2007 | 238 |
| 2008 | 242 |
| 2009 | 142 |
| 2010 | 158 |
| 2011 | 218 |
| 2012 | 189 |
| 2013 | 176 |
| 2014 | 125 |
| 2015 | 349 |
| 2016 | 356 |
| 2016 | 10 |
| 2017 | 317 |
| 2018 | 252 |
| 2019 | 296 |
| 2019 | 10 |
| 2020 | 220 |
| 2020 | 12 |
| 2021 | 250 |
| 2021 | 20 |
| 2022 | 259 |
| 2022 | 89 |
| 2023 | 269 |
| 2023 | 56 |
| 2024 | 280 |
| 2024 | 21 |