67% (1981)

71% (1979)

62% (1980)

51% (1990)

77% (1979)

78% (1980)

73% (1982)

63% (1981)

76% (1980)

62% (1990)

64% (1975)

65% (1981)

50% (1984)

54% (1979)

53% (1981)

69% (1991)

87% (1985)

60% (1980)

70% (1988)

100% (1985)