Twenty years ago, Democrats made up 63.7 percent of the registered voters.
A year ago, Democrats claimed 47.1 percent of the electorate.
Republicans made up 33.3 percent of all registered voters in 1993, growing to 41.4 percent of registered voters a year ago.
Independents grew from 3 percent of the voters in 1993 to 11.5 percent in 2012.
In 1980, Democrats made up 75.8 percent of registered voters in the state, while Republicans numbered 22.8 percent and independents totaled 1.4 percent.
Republicans won control of the House in the 2004 elections and gained control of the Senate for the first time in 2008, the last year Democrats made up at least half the number of registered voters. Democrats were at 50.1 percent, and Republicans were at 39.1 percent.
By 2010, when Republicans won all eight statewide positions on the ballot — giving the GOP control of the governor's office and the Legislature at the same time for the first time — Democrats made up 49 percent of the registered voters, and Republicans had 40.6 percent.