| Year |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
| 1992 |
34 |
26 |
26 |
26 |
34 |
41 |
25 |
22 |
22 |
18 |
23 |
11 |
| 1993 |
22 |
32 |
33 |
40 |
41 |
51 |
35 |
16 |
32 |
26 |
18 |
12 |
| 1994 |
21 |
14 |
33 |
23 |
40 |
22 |
13 |
16 |
17 |
13 |
25 |
15 |
| 1995 |
18 |
27 |
24 |
29 |
21 |
28 |
21 |
17 |
21 |
21 |
14 |
10 |
| 1996 |
20 |
10 |
12 |
16 |
17 |
16 |
15 |
19 |
17 |
15 |
11 |
10 |
| 1997 |
10 |
16 |
15 |
22 |
17 |
21 |
6 |
8 |
12 |
5 |
3 |
9 |
| 1998 |
6 |
6 |
5 |
7 |
9 |
5 |
7 |
3 |
8 |
3 |
4 |
3 |
| 1999 |
4 |
1 |
6 |
9 |
9 |
3 |
14 |
7 |
7 |
6 |
2 |
2 |
| 2000 |
4 |
1 |
2 |
2 |
5 |
3 |
2 |
1 |
3 |
0 |
3 |
1 |
| 2001 |
3 |
3 |
4 |
0 |
5 |
1 |
4 |
2 |
1 |
0 |
2 |
4 |
| 2002 |
2 |
3 |
2 |
4 |
4 |
1 |
2 |
2 |
1 |
3 |
6 |
0 |
| 2003 |
4 |
1 |
3 |
3 |
6 |
5 |
4 |
4 |
3 |
0 |
1 |
1 |
| 2004 |
2 |
4 |
1 |
1 |
1 |
2 |
1 |
1 |
2 |
1 |
2 |
1 |
| 2005 |
3 |
6 |
3 |
1 |
0 |
2 |
3 |
1 |
3 |
0 |
3 |
2 |
| 2006 |
2 |
2 |
0 |
3 |
2 |
0 |
0 |
1 |
1 |
0 |
1 |
1 |
| 2007 |
4 |
0 |
10 |
1 |
3 |
4 |
2 |
22 |
4 |
1 |
1 |
0 |
| 2008 |
4 |
0 |
1 |
5 |
2 |
1 |
1 |
1 |
1 |
1 |
1 |
2 |
| 2009 |
1 |
0 |
5 |
4 |
2 |
14 |
2 |
1 |
2 |
1 |
4 |
3 |
| 2010** |
0 |
0 |
1 |
1 |
2 |
3 |
1 |
1 |
2 |
5 |
16 |
1 |
** Provisional data
Source:1992 - 2010 Labbase 2.