| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Unknown | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1986 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 1987 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 2 | 0 | 8 |
| 1988 | 0 | 1 | 2 | 2 | 3 | 0 | 0 | 1 | 2 | 3 | 2 | 2 | 0 | 18 |
| 1989 | 1 | 1 | 3 | 0 | 0 | 0 | 3 | 2 | 3 | 0 | 1 | 1 | 0 | 15 |
| 1990 | 1 | 1 | 1 | 2 | 0 | 3 | 2 | 0 | 1 | 2 | 2 | 1 | 0 | 16 |
| 1991 | 1 | 2 | 1 | 3 | 0 | 2 | 0 | 0 | 2 | 5 | 4 | 1 | 0 | 21 |
| 1992 | 5 | 3 | 6 | 2 | 3 | 3 | 3 | 2 | 2 | 3 | 4 | 1 | 0 | 37 |
| 1993 | 1 | 7 | 3 | 9 | 5 | 1 | 3 | 1 | 2 | 4 | 3 | 5 | 0 | 44 |
| 1994 | 5 | 2 | 5 | 5 | 1 | 1 | 3 | 4 | 5 | 3 | 5 | 9 | 0 | 48 |
| 1995 | 6 | 4 | 5 | 9 | 6 | 1 | 4 | 3 | 4 | 1 | 1 | 1 | 0 | 45 |
| 1996 | 4 | 5 | 2 | 4 | 7 | 3 | 3 | 1 | 3 | 2 | 5 | 2 | 0 | 41 |
| 1997 | 0 | 1 | 10 | 3 | 0 | 3 | 2 | 3 | 2 | 1 | 1 | 3 | 4 | 33 |
| 1998 | 3 | 5 | 9 | 6 | 7 | 3 | 5 | 8 | 3 | 5 | 6 | 7 | 0 | 67 |
| 1999 | 2 | 6 | 9 | 3 | 4 | 2 | 6 | 3 | 1 | 5 | 2 | 1 | 0 | 44 |
| 2000 | 3 | 1 | 5 | 3 | 1 | 5 | 4 | 0 | 1 | 3 | 2 | 3 | 0 | 31 |
| 2001 | 0 | 1 | 1 | 2 | 2 | 3 | 4 | 2 | 3 | 3 | 6 | 2 | 0 | 29 |
| 2002 | 3 | 2 | 5 | 4 | 2 | 2 | 1 | 5 | 2 | 3 | 2 | 2 | 0 | 33 |
| 2003 | 5 | 4 | 1 | 1 | 3 | 3 | 2 | 3 | 4 | 3 | 0 | 3 | 0 | 32 |
| 2004 | 1 | 3 | 4 | 4 | 2 | 3 | 5 | 2 | 1 | 1 | 4 | 3 | 0 | 33 |
| 2005 | 0 | 2 | 3 | 2 | 2 | 1 | 4 | 4 | 1 | 3 | 0 | 0 | 0 | 22 |
| 2006 | 1 | 2 | 2 | 3 | 1 | 1 | 3 | 1 | 7 | 4 | 3 | 4 | 0 | 32 |
| 2007 | 3 | 5 | 4 | 3 | 5 | 4 | 2 | 2 | 2 | 3 | 2 | 2 | 0 | 37 |
| 2008 | 1 | 0 | 4 | 3 | 5 | 3 | 3 | 1 | 9 | 8 | 1 | 3 | 0 | 41 |
| 2009 | 1 | 0 | 3 | 4 | 1 | 4 | 10 | 1 | 1 | 4 | 2 | 3 | 0 | 34 |
| 2010 | 0 | 2 | 1 | 3 | 1 | 4 | 3 | 3 | 0 | 10 | 1 | 3 | 0 | 31 |
| 2011 | 4 | 5 | 2 | 5 | 1 | 1 | 1 | 0 | 2 | 1 | 0 | 1 | 0 | 23 |
| 2012 | 1 | 0 | 0 | 2 | 2 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 9 |
| 2013 | 4 | 0 | 2 | 1 | 2 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 0 | 12 |
| 2014 | 0 | 1 | 0 | 0 | 2 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 6 |
| 2015 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 3 | 0 | 1 | 0 | 0 | 8 |
| 2016 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
| 2017 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 2018 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 3 |
| 2022 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 0 | 0 | 4 |
| 2023 | 0 | 2 | 0 | 0 | 2 | 0 | 2 | 0 | 1 | 1 | 2 | 1 | 0 | 11 |
| 2024 | 0 | 0 | 0 | 1 | 0 | 2 | 1 | 0 | 3 | 2 | 1 | 1 | 0 | 11 |
| 2025 | 2 | 0 | 2 | 2 | 3 | 2 | 0 | 0 | 2 | 2 | 0 | 0 | 0 | 15 |
| other | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 10 |
| Total | 58 | 69 | 97 | 95 | 73 | 62 | 81 | 54 | 80 | 90 | 67 | 67 | 14 | 907 |