| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
1 | 13.7 | 13.3 | 14.8 | 21.9 | 20.3 | 27.8 | 32.6 | 30.6 | 33.9 | 26.8 | 19.8 | 15.0 |
2 | 16.4 | 14.3 | 17.0 | 19.3 | 19.3 | 25.1 | 33.3 | 29.8 | 31.6 | 22.8 | 16.8 | 15.5 |
3 | 10.0 | 12.3 | 18.6 | 14.2 | 19.6 | 24.4 | 34.1 | 31.5 | 31.8 | 22.3 | 19.1 | 15.5 |
4 | 8.7 | 14.1 | 15.3 | 14.4 | 19.7 | 23.7 | 33.2 | 32.1 | 29.2 | 21.1 | 19.1 | 13.9 |
5 | 10.8 | 13.4 | 16.9 | 16.7 | 14.7 | 26.6 | 33.0 | 29.6 | 27.6 | 23.9 | 19.8 | 13.6 |
6 | 13.6 | 17.7 | 17.5 | 18.2 | 17.3 | 24.3 | 31.9 | 31.0 | 25.8 | 24.8 | 16.2 | 11.8 |
7 | 13.6 | 14.1 | 16.9 | 15.5 | 17.7 | 27.3 | 30.9 | 30.1 | 25.8 | 21.1 | 16.5 | 13.6 |
8 | 7.8 | 15.0 | 17.1 | 17.8 | 16.2 | 26.2 | 31.5 | 30.6 | 24.8 | 23.3 | 15.2 | 13.1 |
9 | 12.9 | 11.8 | 17.1 | 18.4 | 19.4 | 32.4 | 31.4 | 32.7 | 24.6 | 19.8 | 14.6 | 16.9 |
10 | 12.0 | 13.3 | 14.2 | 19.0 | 20.1 | 31.9 | 31.0 | 32.8 | 26.2 | 22.2 | 16.1 | 16.4 |
11 | 10.4 | 15.1 | 18.1 | 15.1 | 17.8 | 28.6 | 28.8 | 35.1 | 28.7 | 24.3 | 15.1 | 12.1 |
12 | 11.7 | 16.9 | 16.4 | 19.2 | 17.7 | 26.4 | 30.8 | 32.9 | 30.7 | 23.9 | 16.5 | 8.6 |
13 | 13.7 | 14.8 | 12.9 | 18.4 | 18.5 | 28.3 | 33.2 | 30.6 | 31.2 | 22.6 | 16.6 | 9.7 |
14 | 18.5 | 16.4 | 15.5 | 14.0 | 20.9 | 34.3 | 32.0 | 30.2 | 31.8 | 20.1 | 17.1 | 15.0 |
15 | 14.9 | 17.0 | 17.6 | 19.1 | 16.1 | 26.1 | 23.6 | 29.1 | 30.5 | 22.5 | 16.0 | 16.0 |
16 | 13.4 | 18.0 | 17.8 | 20.1 | 19.2 | 26.4 | 30.4 | 30.4 | 28.7 | 21.3 | 13.9 | 16.1 |
17 | 12.1 | 15.0 | 16.8 | 20.1 | 19.9 | 28.7 | 30.7 | 29.8 | 27.7 | 16.7 | 13.5 | 17.7 |
18 | 14.4 | 15.4 | 18.2 | 24.1 | 19.7 | 31.7 | 29.9 | 29.7 | 27.8 | 21.9 | 11.4 | 17.2 |
19 | 10.1 | 13.6 | 13.9 | 22.8 | 17.7 | 30.8 | 30.6 | 30.6 | 29.2 | 20.7 | 15.7 | 14.2 |
20 | 11.8 | 16.2 | 14.9 | 24.8 | 18.1 | 29.9 | 31.7 | 33.3 | 25.9 | 21.9 | 15.6 | 14.8 |
21 | 10.3 | 15.8 | 19.8 | 24.9 | 19.4 | | 30.7 | 32.8 | 25.7 | 25.4 | 12.1 | 15.1 |
22 | 9.3 | 16.3 | 21.8 | 24.9 | 20.7 | | 33.2 | 33.6 | 20.8 | 27.4 | 13.6 | 16.0 |
23 | 6.2 | 15.2 | 22.6 | 16.1 | 22.2 | | 37.0 | | 23.9 | 27.2 | 17.5 | 18.7 |
24 | 12.0 | 13.7 | 20.9 | 20.1 | 22.2 | | 37.0 | 30.6 | 26.1 | 16.7 | 16.1 | 16.1 |
25 | 11.3 | 17.9 | 18.4 | 21.7 | 24.3 | | 36.3 | 32.7 | 23.8 | 23.4 | 22.4 | 16.5 |
26 | 12.3 | 21.6 | 15.1 | 18.8 | 21.7 | | 33.8 | 34.3 | 25.4 | 26.5 | 17.7 | 14.7 |
27 | 12.6 | 17.9 | 16.2 | 19.7 | 23.3 | | 31.5 | 33.3 | 22.8 | 23.9 | 15.7 | 15.1 |
28 | 13.1 | 17.3 | 17.3 | 20.0 | 19.7 | 34.9 | 26.8 | 32.5 | 24.8 | 20.4 | 17.8 | 13.0 |
29 | 11.8 | | 20.6 | 16.3 | 21.8 | 36.6 | 28.3 | 32.4 | 24.0 | 20.8 | 17.4 | 11.9 |
30 | 5.4 | | 19.6 | 18.6 | 23.1 | 34.9 | 29.2 | 34.1 | 25.0 | 21.2 | 16.4 | 13.4 |
31 | 7.2 | | 17.9 | | 24.2 | | 29.2 | 34.2 | | 18.7 | | 13.9 |