1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
1: January
2: February
3: March
4: April
5: May
6: June
7: July
8: August
9: September
10: October
11: November
12: December
0: Month not reported
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
0: < 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0