68% (2024)

75% (2009)

78% (2012)

73% (1990)

71% (2005)

70% (1983)

74% (1996)

72% (1977)

68% (1974)

78% (1969)

66% (2014)

65% (2020)

75% (1986)

73% (1972)

70% (1967)

62% (2017)

75% (1973)

74% (1970)

57% (1976)

52% (1988)