| Year | Count |
|---|---|
| 1979 | 5 |
| 1983 | 5 |
| 1984 | 5 |
| 1988 | 11 |
| 1989 | 27 |
| 1990 | 18 |
| 1991 | 22 |
| 1992 | 18 |
| 1993 | 32 |
| 1994 | 5 |
| 1995 | 10 |
| 1997 | 10 |
| 1999 | 26 |
| 2000 | 31 |
| 2003 | 5 |
| 2005 | 5 |
| 2006 | 10 |
| 2007 | 7 |
| 2008 | 49 |
| 2009 | 69 |
| 2010 | 92 |
| 2011 | 144 |
| 2012 | 88 |
| 2013 | 91 |
| 2014 | 95 |
| 2015 | 110 |
| 2016 | 92 |
| 2017 | 91 |
| 2018 | 107 |
| 2019 | 91 |
| 2020 | 311 |
| 2021 | 453 |
| 2022 | 447 |
| 2023 | 520 |
| 2024 | 497 |