| Jan | Feb | March | April | May | June | July | Aug | Sept | Oct | Nov | Dec |
|---|
| 1 | 14.8 | 18.1 | 15.0 | | | | | | | | | |
|---|
| 2 | 14.3 | 17.9 | 12.1 | | | | | | | | | |
|---|
| 3 | 14.7 | 19.9 | 14.0 | | | | | | | | | |
|---|
| 4 | 15.5 | 18.0 | 15.4 | | | | | | | | | |
|---|
| 5 | 16.6 | 18.3 | 15.4 | | | | | | | | | |
|---|
| 6 | 16.8 | 18.5 | 12.9 | | | | | | | | | |
|---|
| 7 | 17.7 | 15.9 | 9.4 | | | | | | | | | |
|---|
| 8 | 17.5 | 13.9 | 8.1 | | | | | | | | | |
|---|
| 9 | 16.1 | 14.9 | 13.6 | | | | | | | | | |
|---|
| 10 | 15.4 | 13.2 | 15.6 | | | | | | | | | |
|---|
| 11 | 15.6 | 11.2 | 14.0 | | | | | | | | | |
|---|
| 12 | 14.1 | 13.2 | 13.5 | | | | | | | | | |
|---|
| 13 | 13.2 | 14.8 | 13.8 | | | | | | | | | |
|---|
| 14 | 14.2 | 15.0 | 10.7 | | | | | | | | | |
|---|
| 15 | 12.7 | 16.1 | 9.3 | | | | | | | | | |
|---|
| 16 | 12.5 | 13.6 | 10.0 | | | | | | | | | |
|---|
| 17 | 13.1 | 15.1 | 17.0 | | | | | | | | | |
|---|
| 18 | 12.6 | 14.3 | 16.7 | | | | | | | | | |
|---|
| 19 | 16.6 | 11.5 | 13.9 | | | | | | | | | |
|---|
| 20 | 15.5 | 13.2 | 12.7 | | | | | | | | | |
|---|
| 21 | 14.4 | 14.7 | 10.3 | | | | | | | | | |
|---|
| 22 | 16.6 | 17.0 | 9.6 | | | | | | | | | |
|---|
| 23 | 16.3 | 13.0 | 7.7 | | | | | | | | | |
|---|
| 24 | 15.7 | 14.2 | 8.9 | | | | | | | | | |
|---|
| 25 | 13.5 | 14.5 | 8.5 | | | | | | | | | |
|---|
| 26 | 12.3 | 15.0 | 15.7 | | | | | | | | | |
|---|
| 27 | 15.3 | 16.3 | 13.3 | | | | | | | | | |
|---|
| 28 | 17.5 | 14.6 | 8.9 | | | | | | | | | |
|---|
| 29 | 18.9 | | | | | | | | | | | |
|---|
| 30 | 17.9 | | | | | | | | | | | |
|---|
| 31 | 18.5 | | | | | | | | | | | |
|---|
|
