| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1 | 52.3 | 60.3 | 34.2 | 49.8 | 64.8 | | | | | | | |
| 2 | 45.0 | 41.6 | 36.1 | 54.3 | 53.9 | | | | | | | |
| 3 | 28.6 | 41.5 | 56.4 | 62.5 | 59.8 | | | | | | | |
| 4 | 23.4 | 45.0 | 43.2 | 64.1 | 80.2 | | | | | | | |
| 5 | 38.7 | 35.9 | 39.0 | 51.7 | 69.5 | | | | | | | |
| 6 | 51.4 | 53.1 | 41.8 | 53.2 | 69.5 | | | | | | | |
| 7 | 58.8 | 46.4 | 61.1 | 57.9 | 69.0 | | | | | | | |
| 8 | 41.9 | 35.9 | 70.2 | 64.5 | 60.2 | | | | | | | |
| 9 | 39.7 | 45.5 | 63.0 | 60.8 | 73.9 | | | | | | | |
| 10 | 43.7 | 44.3 | 39.9 | 62.0 | 61.7 | | | | | | | |
| 11 | 44.1 | 36.6 | 72.6 | 51.6 | 69.1 | | | | | | | |
| 12 | 38.0 | 31.9 | 72.0 | 56.9 | 81.1 | | | | | | | |
| 13 | 42.6 | 43.5 | 75.1 | 65.1 | 82.9 | | | | | | | |
| 14 | 31.5 | 43.9 | 67.4 | 72.5 | 74.7 | | | | | | | |
| 15 | 19.4 | 44.3 | 53.9 | 74.3 | 65.3 | | | | | | | |
| 16 | 31.1 | 37.9 | 52.7 | 91.3 | 80.5 | | | | | | | |
| 17 | 41.1 | 48.5 | 66.0 | 76.5 | 70.7 | | | | | | | |
| 18 | 45.3 | 44.3 | 72.2 | 57.1 | 76.3 | | | | | | | |
| 19 | 29.3 | 42.2 | 78.8 | 74.2 | 82.9 | | | | | | | |
| 20 | 29.2 | 40.1 | 76.8 | 76.6 | | | | | | | | |
| 21 | 19.1 | 42.7 | 72.2 | 78.9 | | | | | | | | |
| 22 | 30.0 | 55.1 | 79.9 | 48.5 | | | | | | | | |
| 23 | 47.4 | 53.4 | 73.3 | 54.1 | | | | | | | | |
| 24 | 47.9 | 36.9 | 65.5 | 57.9 | | | | | | | | |
| 25 | 40.2 | 41.0 | 53.8 | 61.2 | | | | | | | | |
| 26 | 35.2 | 40.8 | 50.5 | 60.5 | | | | | | | | |
| 27 | 49.1 | 53.0 | 47.4 | 53.4 | | | | | | | | |
| 28 | 44.5 | 46.3 | 63.4 | 60.9 | | | | | | | | |
| 29 | 42.1 | 34.8 | 53.6 | 61.6 | | | | | | | | |
| 30 | 37.0 | | 53.2 | 65.3 | | | | | | | | |
| 31 | 54.9 | | 43.7 | | | | | | | | | |