73% (1975)

77% (1976)

66% (2000)

65% (1995)

69% (1998)

61% (2007)

56% (1988)

73% (1994)

75% (1980)

62% (2012)

66% (2011)

65% (1998)

65% (2018)

61% (2015)

58% (1969)

61% (1979)

63% (1998)

58% (2004)

68% (1993)

57% (1998)