| Number of parties N | Fragmentation (stand. dev.) | Polarization (stand. dev.) | Top-three | Strongly dominant party | Top-two | Open |
| 3 | 2.763 (0.189) | 0.265 (0.117) | 100% | 0% | 0% | 0% |
| 4 | 3.339 (0.374) | 0.276 (0.092) | 60.5% | 39.6% | 0% | 0% |
| 5 | 3.984 (0.511) | 0.281 (0.077) | 25.4% | 47.3% | 17.9% | 9.5% |
| 6 | 4.706 (0.608) | 0.282 (0.066) | 6.6% | 24.5% | 30.9% | 38.1% |
| 7 | 5.450 (0.670) | 0.283 (0.060) | 1.9% | 8.1% | 19.2% | 70.8% |
| 3-7 | 4.048 (1.078) | 0.278 (0.086) | 38.9% | 23.9% | 13.6% | 23.7% |