
| Month | WS 1 | WS 2 | WS 3 | WS 4 | WS 5 | WS 6 |
| Jan | 4.6 | 6.5 | 7.4 | 7.7 | ||
| Feb | 5.2 | 7.2 | 8.0 | 8.4 | ||
| Mar | 5.1 | 6.7 | 7.5 | 7.7 | ||
| Apr | 6.4 | 7.7 | 8.4 | 8.7 | ||
| May | 5.0 | 6.4 | 6.8 | 7.1 | ||
| Jun | 5.2 | 6.3 | 6.8 | 7.1 | ||
| Jul | 5.3 | 5.9 | 6.3 | 6.6 | ||
| Aug | 5.3 | 6.7 | 7.4 | 7.4 | ||
| Sep | 5.5 | 7.0 | 7.6 | 7.8 | ||
| Oct | 6.4 | 8.0 | 8.7 | 8.9 | ||
| Nov | ||||||
| Dec | ||||||
| AVG | 5.4 | 6.9 | 7.5 | 7.7 |