58% (1984)

59% (1976)

68% (1978)

66% (1988)

80% (1978)

58% (1977)

55% (1989)

62% (1990)

46% (1979)

66% (1975)

59% (1977)

70% (1983)

59% (1978)

57% (1981)

50% (1981)

53% (1993)

50% (1993)

72% (1978)

59% (1979)

58% (1991)