56% (1986)

57% (1994)

66% (1990)

58% (1988)

57% (1981)

60% (1959)

59% (1982)

57% (1966)

62% (1985)

73% (1965)

64% (1955)

56% (1992)

55% (1988)

73% (1971)

63% (1975)

61% (1971)

40% (2002)

63% (2003)

60% (1982)

68% (1972)