| 104th Congress | 59 | 12 | 20.33% |
| 105th Congress | 66 | 14 | 21.21% |
| 106th Congress | 67 | 14 | 20.89% |
| 107th Congress | 76 | 15 | 19.73% |
| 108th Congress | 77 | 13 | 16.88% |
| 109th Congress | 85 | 14 | 16.47% |
| 110th Congress | 95 | 17 | 17.89% |
| 111th Congress | 96 | 14 | 14.58% |
| 112th Congress | 96 | 15 | 15.62% |
| 113th Congress | 104 | 17 | 16.34% |
| 114th Congress | 109 | 20 | 18.34% |
| 115th Congress | 116 | 22 | 18.96% |
| 116th Congress | 132 | 25 | 18.93% |
| 117th Congress | 155 | 30 | 19.35% |
| 118th Congress | 154 | 30 | 19.48% |