| Year | Count |
|---|---|
| 1972 | 35 |
| 1973 | 21 |
| 1974 | 6 |
| 1975 | 7 |
| 1976 | 23 |
| 1977 | 10 |
| 1991 | 24 |
| 1992 | 33 |
| 1993 | 48 |
| 1994 | 170 |
| 1995 | 76 |
| 1996 | 46 |
| 1997 | 83 |
| 1998 | 101 |
| 1999 | 75 |
| 2000 | 80 |
| 2001 | 63 |
| 2002 | 52 |
| 2003 | 15 |
| 2004 | 44 |
| 2005 | 7 |
| 2006 | 27 |
| 2007 | 28 |
| 2008 | 10 |
| 2008 | 12 |
| 2010 | 10 |
| 2011 | 10 |
| 2012 | 26 |
| 2013 | 22 |
| 2014 | 57 |
| 2015 | 86 |
| 2016 | 43 |
| 2016 | 216 |
| 2017 | 168 |
| 2017 | 323 |
| 2018 | 144 |
| 2018 | 265 |
| 2019 | 225 |
| 2019 | 367 |
| 2020 | 149 |
| 2020 | 424 |
| 2021 | 161 |
| 2021 | 482 |
| 2022 | 196 |
| 2022 | 361 |
| 2023 | 124 |
| 2023 | 316 |
| 2024 | 34 |
| 2024 | 153 |