69% (2012)

68% (1985)

73% (1988)

72% (1994)

69% (1980)

67% (1979)

63% (2010)

58% (1978)

66% (2002)

74% (1999)

69% (1996)

65% (1992)

58% (1993)

50% (1992)

74% (2015)

69% (2010)

71% (1987)

66% (1995)

69% (2002)

62% (2023)