Although California still has many uncounted ballots, it appears likely that only 8,000,000 persons voted in the November 4, 2014 election. If so, that would mean only 44.9% of the registered voters participated. California has never before had a gubernatorial general election with fewer than 50% of the registered voters voting.
Although it is true turnout was down in the November 2014 election in most states, California’s turnout appears to be the 12th worst of the 50 states. See this November 7 chart prepared by Political Science Professor Michael P. McDonald, giving his estimate of the number of voters in each state, divided by the number of persons who could have voted if they had registered or were registered.
As of November 8, fewer than 6,000,000 votes have been counted for California Governor, according to the Secretary of State’s web page.