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Voter Turnout in Primary Elections (even)
| Election Date | Number Registered Electors | Number of Electors Voting | Turnout Percentage | | March 6, 2012 | 7,722,180 | 1,970,753 | 25.52% | May 4, 2010
| 8,013,558 | 1,814,244
| 22.64%
| | March 4, 2008 | 7,826,480 | 3,603,523 | 46.04% | | May 2, 2006 | 7,685,088 | 1,866,091 | 24.28% | | March 2, 2004 | 7,204,856 | 2,365,969 | 32.84% | | May 7, 2002 | 7,058,067 | 1,365,753 | 19.40% | | March 7, 2000 | 7,229,511 | 2,526,590 | 34.90% | | May 3, 1998 | 7,006,556 | 1,991,002 | 28.00% | | March 19, 1996 | 6,614,085 | 1,953,639 | 29.53% | | May 3, 1994 | 6,065,867 | 2,001,736 | 33.00% | | May 8, 1990 | 5,944,658 | 1,842,844 | 31.00% | | May 6, 1986 | 6,031,329 | 1,628,459 | 27.00% | | June 8, 1982 | | 1,942,068 | | | June 6, 1978* | | 1,475,221 | | | May 7, 1974 | | 1,822,909 | | | May 5, 1970 | | 2,030,263 | | | May 3, 1966 | | 1,414,386 | | | May 8, 1962 | | 1,328,563 | |
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