66% (1981)

70% (1979)

63% (1981)

51% (1990)

78% (1980)

76% (1979)

63% (1980)

73% (1982)

50% (1984)

62% (1990)

52% (1981)

76% (1980)

54% (1979)

48% (1981)

66% (1981)

64% (1975)

70% (1988)

62% (1987)

87% (1985)

64% (1990)