| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
1 | 22.2 | 24.0 | 21.3 | | | | | | | | | |
2 | 26.1 | 27.8 | 25.8 | | | | | | | | | |
3 | 23.3 | 23.3 | 25.5 | | | | | | | | | |
4 | 28.5 | 23.3 | 28.3 | | | | | | | | | |
5 | 29.1 | 24.5 | 22.5 | | | | | | | | | |
6 | 24.2 | 26.9 | 18.9 | | | | | | | | | |
7 | 23.7 | 27.4 | 24.8 | | | | | | | | | |
8 | 28.2 | 27.2 | 23.5 | | | | | | | | | |
9 | 31.5 | 21.9 | 25.3 | | | | | | | | | |
10 | 26.5 | 29.4 | 21.4 | | | | | | | | | |
11 | 31.7 | 22.5 | 26.1 | | | | | | | | | |
12 | 27.8 | 20.9 | 23.4 | | | | | | | | | |
13 | 34.9 | 26.6 | 27.4 | | | | | | | | | |
14 | 33.5 | 31.2 | 21.2 | | | | | | | | | |
15 | 25.8 | 32.2 | 19.8 | | | | | | | | | |
16 | 25.1 | 29.3 | 18.0 | | | | | | | | | |
17 | 30.6 | 28.8 | 23.4 | | | | | | | | | |
18 | 32.3 | 28.2 | 20.5 | | | | | | | | | |
19 | 31.7 | 29.9 | | | | | | | | | | |
20 | 33.9 | 26.4 | | | | | | | | | | |
21 | 32.4 | 23.8 | | | | | | | | | | |
22 | 25.6 | 25.3 | | | | | | | | | | |
23 | 30.8 | 28.1 | | | | | | | | | | |
24 | 24.4 | 30.3 | | | | | | | | | | |
25 | 23.9 | 24.8 | | | | | | | | | | |
26 | 24.1 | 23.6 | | | | | | | | | | |
27 | 24.7 | 27.9 | | | | | | | | | | |
28 | 26.6 | 26.1 | | | | | | | | | | |
29 | 21.1 | 22.4 | | | | | | | | | | |
30 | 20.9 | | | | | | | | | | | |
31 | 21.7 | | | | | | | | | | | |
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