| Year | Count |
|---|---|
| 1986 | 119 |
| 1987 | 75 |
| 1988 | 34 |
| 1990 | 52 |
| 1991 | 5 |
| 1992 | 5 |
| 1994 | 18 |
| 1995 | 12 |
| 1996 | 6 |
| 1997 | 18 |
| 1998 | 5 |
| 2001 | 6 |
| 2002 | 7 |
| 2003 | 10 |
| 2004 | 30 |
| 2004 | 12 |
| 2005 | 20 |
| 2006 | 29 |
| 2007 | 89 |
| 2008 | 82 |
| 2009 | 49 |
| 2009 | 6 |
| 2010 | 92 |
| 2011 | 145 |
| 2011 | 134 |
| 2012 | 65 |
| 2012 | 261 |
| 2013 | 133 |
| 2013 | 460 |
| 2014 | 87 |
| 2014 | 651 |
| 2015 | 156 |
| 2015 | 1,442 |
| 2016 | 148 |
| 2016 | 1,838 |
| 2017 | 148 |
| 2017 | 2,531 |
| 2018 | 86 |
| 2018 | 2,415 |
| 2019 | 69 |
| 2019 | 2,292 |
| 2020 | 46 |
| 2020 | 1,988 |
| 2021 | 79 |
| 2021 | 2,172 |
| 2022 | 56 |
| 2022 | 2,021 |
| 2023 | 33 |
| 2023 | 1,785 |
| 2024 | 38 |
| 2024 | 1,810 |