58% (1973)

48% (1982)

62% (1980)

60% (1989)

63% (1987)

63% (1989)

73% (1984)

65% (1982)

70% (1986)

70% (1981)

63% (1984)

54% (1985)

68% (1981)

70% (1987)

37% (1976)

65% (1984)

82% (1984)

70% (1978)

63% (1974)

63% (1988)