72% (1976)

66% (1981)

58% (1996)

76% (1995)

50% (1983)

70% (1999)

63% (1980)

77% (1997)

0% (1960)

75% (1985)

55% (1950)

68% (1998)

66% (1992)

78% (1986)

67% (1958)

78% (1993)

68% (1971)

68% (2002)

64% (1967)

79% (1986)