| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
| 1 | 29.4 | 24.4 | 27.3 | 16.8 | 15.5 | 21.6 | | | | | | |
| 2 | 27.7 | 32.5 | 22.4 | 19.7 | 18.7 | 22.0 | | | | | | |
| 3 | 19.5 | 29.7 | 16.9 | 22.2 | 18.2 | 17.3 | | | | | | |
| 4 | 20.9 | 20.0 | 19.3 | 24.3 | 16.5 | 19.7 | | | | | | |
| 5 | 24.5 | 22.4 | 22.2 | 20.7 | 20.0 | 20.9 | | | | | | |
| 6 | 28.0 | 26.2 | 26.8 | 20.4 | 21.9 | 20.8 | | | | | | |
| 7 | 28.6 | 29.5 | 26.4 | 14.4 | 22.6 | 14.7 | | | | | | |
| 8 | 24.4 | 28.2 | 26.2 | 22.0 | 22.0 | 19.8 | | | | | | |
| 9 | 32.6 | 26.3 | 24.1 | 23.5 | 22.5 | 13.5 | | | | | | |
| 10 | 32.3 | 28.0 | 21.2 | 19.8 | 22.3 | 12.9 | | | | | | |
| 11 | 36.4 | 25.3 | 19.8 | 19.4 | 14.6 | 15.2 | | | | | | |
| 12 | 28.0 | 26.4 | 23.4 | 23.3 | 20.5 | 15.9 | | | | | | |
| 13 | 28.8 | 30.5 | 30.2 | 22.2 | 15.7 | 16.1 | | | | | | |
| 14 | 28.8 | 21.4 | 21.9 | 23.2 | 15.4 | 19.1 | | | | | | |
| 15 | 24.2 | 17.0 | 21.6 | 21.4 | 14.1 | 19.0 | | | | | | |
| 16 | 30.9 | 24.5 | 27.4 | 22.5 | 12.5 | | | | | | | |
| 17 | 19.5 | 26.5 | 22.7 | 22.0 | 15.0 | | | | | | | |
| 18 | 16.2 | 24.8 | 26.4 | 23.2 | 12.7 | | | | | | | |
| 19 | 19.5 | 28.6 | 20.1 | 23.5 | 15.1 | | | | | | | |
| 20 | 20.0 | 28.8 | 21.5 | 18.4 | 19.2 | | | | | | | |
| 21 | 17.0 | 23.6 | 20.0 | 13.8 | 19.7 | | | | | | | |
| 22 | 30.7 | 27.4 | 21.6 | 14.3 | 17.6 | | | | | | | |
| 23 | 29.1 | 21.3 | 21.2 | 15.4 | 18.0 | | | | | | | |
| 24 | 23.3 | 25.7 | 24.9 | 16.1 | 15.6 | | | | | | | |
| 25 | 25.7 | 21.7 | 22.5 | 17.7 | 16.0 | | | | | | | |
| 26 | 25.4 | 29.0 | 20.0 | 22.6 | 19.0 | | | | | | | |
| 27 | 24.8 | 22.0 | 23.9 | 16.8 | 15.4 | | | | | | | |
| 28 | 24.8 | 20.2 | 29.1 | 22.2 | 19.6 | | | | | | | |
| 29 | 31.5 | | 24.2 | 23.2 | 15.8 | | | | | | | |
| 30 | 24.7 | | 27.6 | 15.7 | 17.6 | | | | | | | |
| 31 | 30.6 | | 22.4 | | 19.6 | | | | | | | |
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