71% (1978)

67% (1968)

67% (1952)

73% (1962)

76% (2015)

66% (1997)

64% (1975)

67% (2009)

78% (1964)

55% (1959)

77% (1994)

63% (2006)

73% (1994)

72% (1983)

63% (1971)

74% (1977)

40% (1966)

68% (2011)

69% (1972)

65% (1992)