| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
1 | 11.4 | 16.3 | | | | | | | | | | |
2 | 12.6 | 14.5 | | | | | | | | | | |
3 | 11.0 | 13.7 | | | | | | | | | | |
4 | 5.2 | 12.9 | | | | | | | | | | |
5 | 2.7 | 12.7 | | | | | | | | | | |
6 | 3.3 | 7.0 | | | | | | | | | | |
7 | 7.0 | 7.2 | | | | | | | | | | |
8 | 3.4 | 5.2 | | | | | | | | | | |
9 | 5.4 | 14.2 | | | | | | | | | | |
10 | 3.9 | 13.6 | | | | | | | | | | |
11 | 2.7 | 12.5 | | | | | | | | | | |
12 | 5.0 | | | | | | | | | | | |
13 | 5.9 | | | | | | | | | | | |
14 | 4.3 | | | | | | | | | | | |
15 | 5.9 | | | | | | | | | | | |
16 | 5.7 | | | | | | | | | | | |
17 | 5.8 | | | | | | | | | | | |
18 | 4.2 | | | | | | | | | | | |
19 | 4.0 | | | | | | | | | | | |
20 | 4.0 | | | | | | | | | | | |
21 | 3.8 | | | | | | | | | | | |
22 | 6.9 | | | | | | | | | | | |
23 | 7.7 | | | | | | | | | | | |
24 | 7.5 | | | | | | | | | | | |
25 | 7.2 | | | | | | | | | | | |
26 | 11.1 | | | | | | | | | | | |
27 | 8.8 | | | | | | | | | | | |
28 | 3.2 | | | | | | | | | | | |
29 | 8.9 | | | | | | | | | | | |
30 | 11.1 | | | | | | | | | | | |
31 | 17.0 | | | | | | | | | | | |
|