62% (1984)

80% (1976)

60% (1983)

84% (1980)

70% (1980)

67% (1984)

57% (1979)

67% (1988)

63% (1977)

63% (1961)

62% (1985)

80% (1985)

77% (1974)

64% (1987)

63% (1986)

63% (1985)

57% (1983)

67% (1988)

67% (1980)

67% (1978)