| Year | Count |
|---|---|
| 1954 | 5 |
| 1960 | 14 |
| 1961 | 5 |
| 1965 | 5 |
| 1983 | 5 |
| 1984 | 6 |
| 1986 | 13 |
| 1987 | 5 |
| 1988 | 8 |
| 1989 | 8 |
| 1990 | 6 |
| 1991 | 7 |
| 1992 | 11 |
| 1993 | 13 |
| 1994 | 16 |
| 1995 | 22 |
| 1996 | 19 |
| 1997 | 34 |
| 1998 | 27 |
| 1999 | 52 |
| 2000 | 26 |
| 2001 | 45 |
| 2002 | 51 |
| 2003 | 53 |
| 2004 | 57 |
| 2005 | 46 |
| 2006 | 85 |
| 2007 | 58 |
| 2008 | 70 |
| 2009 | 72 |
| 2010 | 68 |
| 2011 | 56 |
| 2012 | 65 |
| 2013 | 70 |
| 2014 | 85 |
| 2015 | 72 |
| 2016 | 213 |
| 2017 | 270 |
| 2018 | 264 |
| 2019 | 214 |
| 2020 | 258 |
| 2021 | 320 |
| 2022 | 402 |
| 2023 | 362 |
| 2024 | 406 |