78% (1971)

68% (1988)

84% (1974)

60% (1980)

60% (1978)

72% (1975)

81% (1975)

70% (1989)

70% (1977)

70% (1978)

60% (1975)

77% (1974)

60% (1976)

70% (1973)

62% (2004)

70% (1974)

45% (1986)

71% (1976)

60% (1963)

62% (1990)