63% (2004)

62% (2002)

65% (2007)

63% (1984)

68% (2010)

69% (1987)

65% (2000)

73% (2000)

63% (2000)

71% (2006)

73% (2002)

75% (1999)

60% (2000)

60% (2007)

70% (1998)

57% (1991)

64% (1993)

61% (1988)

71% (2004)

75% (1999)