| Period | Floor 1 | Floor 2 | Floor 3 | Floor 4 | ||||
| Period average (%) | Standard deviation (%) | Period average (%) | Standard deviation (%) | Period average (%) | Standard deviation (%) | Period average (%) | Standard deviation (%) | |
| May | 55.0 | 5.4 | 54.3 | 5.1 | 54.3 | 5.7 | 57.5 | 7.2 |
| June | 53.7 | 7.8 | 51.8 | 8.3 | 52.5 | 7.6 | 53.5 | 12.2 |
| July | 53.7 | 13.0 | 51.0 | 12.6 | 51.4 | 12.6 | 51.0 | 18.0 |
| August | 39.5 | 11.5 | 37.1 | 11.6 | 37.7 | 11.5 | 36.3 | 15.4 |
| September | 42.3 | 7.8 | 40.4 | 7.7 | 40.4 | 7.7 | 38.5 | 7.0 |