| Percentage | President | Year |
| 100.0% | |
| 100.0% | |
| 99.6% | |
| 98.5% | |
| 97.6% | |
| 96.7% | |
| 92.0% | |
| 91.0% | |
| 90.9% | |
| 90.3% | |
| 88.9% | |
| 86.1% | |
| 85.8% | |
| 85.6% | |
| 84.3% | |
| 83.6% | |
| 83.2% | |
| 81.95% | |
| 81.92% | |
| 81.4% | |
| 79.6% | |
| 79.2% | |
| 76.6% | |
| 76.1% | |
| 72.8% | |
| 71.9% | |
| 70.6% | |
| 70.4% | |
| | Percentage | President | Year |
| 69.7% | |
| 68.8% | |
| 68.2% | |
| 67.8% | |
| 66.5% | |
| 65.3% | |
| 62.4% | |
| 61.8% | |
| 60.6% | |
| 59.4% | |
| 59.0% | |
| 58.8% | |
| 58.1% | |
| 58.0% | |
| 57.8% | |
| 57.1% | |
| 56.4% | |
| 56.2% | |
| 55.9% | |
| 55.2% | |
| 54.6% | |
| 53.2% | |
| 52.9% | |
| 52.2% | |
| 51.1% | |
| 50.5% | |
| 50.1% | |
| 32.2% | |
|