Voter Registration Trend: 2000 – 2022
| Year | D | R | NP | O | Total not D or R | Change NP | Change not D or R |
| 2000 | 41.6 | 41.6 | 14.0 | 2.8 | 16.8 | ||
| 2001 | 41.7 | 41.4 | 14.0 | 2.9 | 16.9 | 0.0 | 0.1 |
| 2002 | 40.8 | 41.6 | 14.6 | 3.0 | 17.6 | 0.6 | 0.7 |
| 2003 | 40.3 | 41.3 | 15.3 | 3.1 | 18.4 | 0.7 | 0.8 |
| 2004 | 40.2 | 40.4 | 15.1 | 4.3 | 19.4 | -0.2 | 1.0 |
| 2005 | 40.1 | 41.0 | 14.5 | 4.4 | 18.9 | -0.6 | -0.5 |
| 2006 | 40.1 | 39.4 | 15.4 | 5.1 | 20.5 | 0.9 | 1.6 |
| 2007 | 40.5 | 40.0 | 14.4 | 5.1 | 19.5 | -1.0 | -1.0 |
| 2008 | 44.0 | 35.5 | 15.3 | 5.2 | 20.5 | 0.9 | 1.0 |
| 2009 | 43.4 | 36.0 | 15.3 | 5.3 | 20.6 | 0.0 | 0.1 |
| 2010 | 42.2 | 36.3 | 15.8 | 5.7 | 21.5 | 0.5 | 0.9 |
| 2011 | 41.5 | 36.8 | 15.9 | 5.8 | 21.7 | 0.1 | 0.2 |
| 2012 | 42.1 | 34.4 | 17.5 | 6.0 | 23.5 | 1.6 | 1.8 |
| 2013 | 41.4 | 34.9 | 17.6 | 6.1 | 23.7 | 0.1 | 0.2 |
| 2014 | 39.7 | 34.6 | 19.3 | 6.4 | 25.7 | 1.7 | 2.0 |
| 2015 | 39.3 | 34.7 | 19.6 | 6.4 | 26.0 | 0.3 | 0.3 |
| 2016 | 39.1 | 35.1 | 19.6 | 6.3 | 25.9 | 0.0 | -0.1 |
| 2017 | 38.7 | 33.5 | 21.3 | 6.5 | 27.8 | 1.7 | 1.9 |
| 2018 | 38.4 | 33.4 | 21.9 | 6.3 | 28.2 | 0.6 | 0.4 |
| 2019 | 38.3 | 33.3 | 22.2 | 6.3 | 28.5 | 0.3 | 0.3 |
| 2020 | 36.6 | 32.4 | 24.1 | 6.9 | 31.0 | 1.9 | 2.5 |
| 2021 | 33.9 | 29.9 | 27.7 | 8.5 | 36.2 | 3.6 | 5.2 |
| 2022 | 32.4 | 29.7 | 30.4 | 7.6 | 37.9 | 2.7 | 1.7 |
| Net | -9.2 | -11.9 | 16.4 | 4.8 | 21.1 |
