81% (1981)

59% (1982)

84% (1980)

82% (1973)

77% (1974)

73% (1987)

67% (1988)

82% (1975)

64% (1987)

63% (1961)

70% (1976)

73% (1982)

58% (1975)

82% (1978)

63% (1977)

57% (1979)

67% (1984)

77% (1985)

80% (1976)

70% (1980)