| January | 25.20% |
| February | |
| March | |
| April | |
| May | |
| June | |
| July | |
| August | |
| September | |
| October | |
| November | |
| December |
| January | 28.43% |
| February | 28.04% |
| March | 31.89% |
| April | 32.25% |
| May | 31.12% |
| June | 28.46% |
| July | 27.82% |
| August | 28.40% |
| September | 26.10% |
| October | 22.57% |
| November | 23.12% |
| December | 24.35% |
| January | 32.78% |
| February | 31.69% |
| March | 30.18% |
| April | 26.68% |
| May | 27.85% |
| June | 24.39% |
| July | 24.64% |
| August | 26.17% |
| September | 34.16% |
| October | 37.62% |
| November | 37.07% |
| December | 32.48% |