43% (1964)

63% (1988)

37% (2001)

56% (1981)

69% (1982)

60% (1985)

40% (2003)

54% (2010)

60% (2012)

79% (2002)

38% (2004)

66% (1993)

45% (1987)

75% (1971)

50% (2005)

77% (2008)

60% (1987)

60% (1976)

73% (2004)

55% (2007)