| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2018 | 3 | 1 | 1 | 1 | |||||||||
| 2017 | 13 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | |
| 2016 | 17 | 2 | 4 | 1 | 3 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| 2015 | 7 | 1 | 1 | 1 | 1 | 2 | 1 | ||||||
| 2014 | 19 | 2 | 3 | 2 | 1 | 4 | 1 | 1 | 1 | 1 | 3 | ||
| 2013 | 7 | 1 | 2 | 1 | 1 | 1 | 1 | ||||||
| 2012 | 1 | 1 | |||||||||||
| 2011 | 3 | 1 | 2 | ||||||||||
| 2010 | 6 | 1 | 1 | 1 | 1 | 1 | 1 | ||||||
| 2009 | 9 | 1 | 3 | 3 | 1 | 1 | |||||||
| 2008 | 22 | 4 | 4 | 3 | 1 | 1 | 2 | 3 | 1 | 1 | 1 | 1 | |
| 2007 | 26 | 1 | 3 | 4 | 1 | 1 | 3 | 1 | 2 | 2 | 2 | 3 | 3 |
| 2006 | 26 | 1 | 2 | 1 | 1 | 2 | 4 | 2 | 2 | 3 | 2 | 4 | 2 |
| 2005 | 28 | 3 | 4 | 3 | 6 | 3 | 2 | 2 | 1 | 1 | 1 | 2 | |
| 2004 | 39 | 4 | 5 | 1 | 8 | 4 | 2 | 2 | 4 | 1 | 5 | 2 | 1 |
| 2003 | 41 | 3 | 6 | 5 | 6 | 4 | 2 | 4 | 2 | 3 | 3 | 3 | |
| 2002 | 32 | 4 | 2 | 2 | 3 | 4 | 1 | 1 | 3 | 3 | 5 | 4 | |
| 2001 | 41 | 6 | 4 | 3 | 6 | 3 | 3 | 3 | 3 | 3 | 2 | 3 | 2 |
| 2000 | 9 | 2 | 1 | 2 | 2 | 1 | 1 | ||||||
| 1999 | 8 | 4 | 1 | 1 | 1 | 1 | |||||||
| 1998 | 2 | 2 | |||||||||||
| 1997 | 3 | 1 | 1 | 1 | |||||||||
| 1996 | 44 | 4 | 7 | 4 | 3 | 1 | 4 | 1 | 3 | 2 | 4 | 7 | 4 |
| 1995 | 33 | 2 | 1 | 3 | 8 | 4 | 6 | 4 | 2 | 3 | |||
| 1994 | 31 | 1 | 4 | 6 | 1 | 5 | 4 | 4 | 3 | 1 | 1 | 1 | |
| 1993 | 31 | 5 | 6 | 8 | 3 | 1 | 2 | 1 | 4 | 1 | |||
| 1992 | 53 | 2 | 4 | 5 | 5 | 9 | 6 | 11 | 7 | 2 | 1 | 1 | |
| 1991 | 13 | 1 | 1 | 1 | 2 | 3 | 1 | 2 | 1 | 1 | |||
| 1990 | 10 | 1 | 1 | 2 | 1 | 1 | 2 | 1 | 1 | ||||
| 1989 | 4 | 1 | 2 | 1 | |||||||||
| 581 |
