28% (1997)

67% (1972)

80% (1990)

51% (2002)

61% (1955)

77% (1975)

72% (1969)

66% (1984)

70% (1967)

78% (1988)

64% (1955)

0% (1956)

50% (1968)

65% (1961)

70% (1981)

73% (1971)

71% (1988)

55% (2003)

72% (1992)

83% (1980)