73% (1995)

76% (1973)

76% (1976)

73% (2002)

77% (1983)

63% (1981)

69% (1973)

69% (1966)

58% (1972)

65% (1967)

60% (1995)

64% (1979)

61% (1974)

50% (1980)

59% (2007)

55% (1993)

67% (1998)

51% (1990)

66% (1977)

58% (1982)