77% (1980)

75% (1976)

70% (1977)

60% (1979)

70% (1973)

50% (2005)

84% (1969)

85% (1986)

80% (1988)

70% (1979)

64% (2007)

72% (1974)

78% (1987)

56% (2011)

82% (1980)

76% (1980)

70% (2012)

65% (2016)

76% (1978)

75% (1975)