| 2022 | Democratic | 0 | 0.0% | | | Republican | 1,085,139 | 77.6% | | | Other | 313,253 | 22.4% | |
| 2018 | Democratic | 0 | 0.0% | | | Republican | 1,015,366 | 75.7% | | | Other | 325,934 | 24.3% | |
| 2014 | Democratic | 0 | 0.0% | | | Republican | 759,640 | 79.7% | | | Independent | 106,223 | 11.1% | | | Other | 87,753 | 9.2% | |
| 2010 | Democratic | 525,229 | 39.8% | | | Republican | 792,260 | 60.1% | | | Other | 533 | 0.0% | |
| 2006 | Democratic | 429,255 | 40.3% | | | Republican | 635,903 | 59.7% | | | Other | 319 | 0.0% | |
| 2002 | Democratic | 525,595 | 49.4% | | | Republican | 537,168 | 50.5% | | | Other | 307 | 0.0% | |
| 1994 | Democratic | 338,589 | 38.2% | | | Republican | 546,670 | 61.7% | | | Other | 237 | 0.0% | |
| 1990 | Democratic | 334,288 | 48.0% | | | Republican | 362,087 | 52.0% | | | Other | 263 | 0.0% | |
| 1982 | Democratic | 335,718 | 51.5% | | | Republican | 316,523 | 48.5% | | | Other | 65 | 0.0% | |
| 1978 | Democratic | 264,499 | 44.4% | | | Republican | 331,038 | 55.6% | | | Other | 257 | 0.0% | |
| 1974 | Democratic | 342,716 | 69.3% | | | Republican | 140,637 | 28.5% | | | Other | 10,956 | 2.2% | |
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