77% (1991)

59% (1979)

58% (1980)

60% (1996)

73% (1976)

73% (1989)

64% (1983)

69% (1990)

34% (1986)

69% (1981)

53% (1986)

68% (1988)

68% (1977)

72% (1983)

75% (1981)

69% (1985)

55% (1988)

63% (1977)

40% (1980)

48% (1998)