| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
1 | 18.9 | 27.9 | 28.4 | 25.7 | 19.9 | 18.9 | 14.9 | | | | | |
2 | 22.6 | 22.5 | 25.5 | 20.2 | 14.3 | 18.8 | 14.8 | | | | | |
3 | 26.3 | 23.6 | 29.3 | 25.0 | 15.8 | 19.2 | 19.4 | | | | | |
4 | 16.4 | 24.5 | 25.7 | 26.3 | 14.4 | 22.7 | 22.5 | | | | | |
5 | 16.8 | 22.9 | 18.2 | 26.8 | 14.3 | 23.0 | 16.3 | | | | | |
6 | 16.2 | 15.9 | 18.6 | 25.4 | 19.1 | 12.0 | 12.5 | | | | | |
7 | 19.8 | 25.8 | 20.9 | 25.3 | 22.4 | 11.0 | 11.4 | | | | | |
8 | 20.9 | 28.8 | 23.6 | 23.9 | 22.6 | 14.7 | 11.2 | | | | | |
9 | 18.5 | 29.6 | 20.5 | 18.9 | 23.0 | 13.9 | 11.5 | | | | | |
10 | 18.1 | 25.2 | 22.7 | 20.6 | 21.7 | 13.1 | 16.6 | | | | | |
11 | 19.8 | 20.0 | 24.9 | 23.3 | 15.6 | 20.4 | 15.8 | | | | | |
12 | 17.6 | 22.2 | 26.3 | 23.0 | 19.0 | 15.8 | 18.7 | | | | | |
13 | 18.7 | 22.8 | 19.9 | 19.0 | 20.7 | 20.1 | | | | | | |
14 | 19.1 | 23.9 | 21.0 | 26.1 | 16.2 | 12.6 | | | | | | |
15 | 18.7 | 24.1 | 27.7 | 17.7 | 19.4 | 14.6 | | | | | | |
16 | 18.8 | 22.0 | 27.5 | 17.5 | 22.7 | 11.8 | | | | | | |
17 | 20.6 | 26.7 | 28.5 | 19.3 | 21.7 | 12.7 | | | | | | |
18 | 20.9 | 32.6 | 26.6 | 22.5 | 21.2 | 15.2 | | | | | | |
19 | 21.1 | 27.5 | 24.2 | 26.7 | 16.0 | 17.6 | | | | | | |
20 | 21.2 | 31.4 | 18.5 | 26.0 | 17.1 | 17.9 | | | | | | |
21 | 22.5 | 29.8 | 20.6 | 25.2 | 15.6 | 13.5 | | | | | | |
22 | 18.4 | 25.3 | 25.4 | 16.9 | 16.6 | 13.7 | | | | | | |
23 | 24.8 | 26.0 | 25.5 | 16.2 | 17.1 | 11.8 | | | | | | |
24 | 22.5 | 24.9 | 24.2 | 15.8 | 18.4 | 15.7 | | | | | | |
25 | 30.0 | 30.0 | 24.8 | 17.9 | 19.7 | 17.9 | | | | | | |
26 | 28.7 | 27.1 | 22.0 | 19.9 | 20.2 | 17.7 | | | | | | |
27 | 22.7 | 23.8 | 26.9 | 19.8 | 20.5 | 19.5 | | | | | | |
28 | 20.5 | 23.6 | 22.4 | 25.0 | 19.6 | 20.6 | | | | | | |
29 | 28.1 | | 21.5 | 21.9 | 20.8 | 17.7 | | | | | | |
30 | 26.2 | | 25.9 | 21.1 | 20.4 | 17.6 | | | | | | |
31 | 26.1 | | 22.5 | | 20.5 | | | | | | | |
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