76% (1982)

50% (1975)

48% (1981)

62% (1971)

58% (1976)

44% (1992)

60% (1981)

43% (1978)

56% (1977)

58% (1987)

50% (1980)

57% (1979)

71% (1980)

50% (1990)

50% (1984)

59% (1974)

66% (1993)

35% (1987)

50% (1986)

50% (1977)