71% (1965)

65% (2009)

62% (1958)

73% (1951)

59% (1988)

75% (1978)

73% (1977)

60% (1997)

66% (1999)

73% (1999)

56% (2004)

64% (1969)

62% (2013)

61% (1992)

68% (1973)

63% (1991)

68% (1985)

52% (2001)

61% (2020)

65% (1985)