| Year | Count |
|---|---|
| 1990 | 45 |
| 1991 | 5 |
| 1991 | 189 |
| 1992 | 79 |
| 1992 | 671 |
| 1993 | 129 |
| 1993 | 2,243 |
| 1994 | 19 |
| 1994 | 1,569 |
| 1995 | 584 |
| 1996 | 285 |
| 1997 | 75 |
| 1998 | 39 |
| 1999 | 13 |
| 2000 | 13 |
| 2001 | 16 |
| 2002 | 10 |
| 2003 | 11 |
| 2004 | 6 |
| 2005 | 6 |
| 2010 | 5 |
| 2012 | 24 |
| 2013 | 25 |
| 2014 | 31 |
| 2015 | 34 |
| 2016 | 35 |
| 2017 | 31 |
| 2018 | 14 |
| 2019 | 11 |
| 2020 | 12 |
| 2021 | 20 |
| 2023 | 12 |