56% (1989)

72% (1982)

66% (1987)

68% (1975)

72% (1978)

62% (1990)

57% (1979)

57% (1991)

59% (1976)

63% (1976)

60% (1980)

56% (1986)

50% (1993)

72% (1982)

59% (1977)

50% (1981)

58% (1977)

53% (1980)

73% (1979)

70% (1985)