| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
1 | 20.1 | 31.5 | | | | | | | | | | |
2 | 24.8 | 24.2 | | | | | | | | | | |
3 | 28.0 | 25.3 | | | | | | | | | | |
4 | 16.6 | 27.1 | | | | | | | | | | |
5 | 16.3 | 23.9 | | | | | | | | | | |
6 | 13.9 | 17.3 | | | | | | | | | | |
7 | 19.0 | 25.7 | | | | | | | | | | |
8 | 20.9 | 28.6 | | | | | | | | | | |
9 | 16.7 | 32.9 | | | | | | | | | | |
10 | 16.7 | 28.0 | | | | | | | | | | |
11 | 18.7 | 22.2 | | | | | | | | | | |
12 | 14.9 | | | | | | | | | | | |
13 | 17.0 | | | | | | | | | | | |
14 | 19.3 | | | | | | | | | | | |
15 | 18.2 | | | | | | | | | | | |
16 | 18.7 | | | | | | | | | | | |
17 | 20.8 | | | | | | | | | | | |
18 | 21.6 | | | | | | | | | | | |
19 | 20.9 | | | | | | | | | | | |
20 | 21.9 | | | | | | | | | | | |
21 | 22.8 | | | | | | | | | | | |
22 | 17.4 | | | | | | | | | | | |
23 | 27.0 | | | | | | | | | | | |
24 | 23.4 | | | | | | | | | | | |
25 | 34.3 | | | | | | | | | | | |
26 | 31.2 | | | | | | | | | | | |
27 | 23.4 | | | | | | | | | | | |
28 | 21.2 | | | | | | | | | | | |
29 | 29.1 | | | | | | | | | | | |
30 | 28.8 | | | | | | | | | | | |
31 | 29.1 | | | | | | | | | | | |
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