72% (1972)

70% (1983)

86% (2006)

79% (1981)

78% (2016)

72% (1969)

69% (1960)

69% (2020)

76% (1990)

78% (2005)

83% (1969)

79% (2001)

64% (2008)

65% (2013)

71% (2003)

82% (2005)

69% (1982)

80% (2005)

72% (1996)

74% (2000)