73% (1988)

67% (1980)

59% (1980)

63% (1974)

68% (1976)

61% (1973)

59% (1986)

65% (1986)

48% (1979)

52% (1989)

64% (1977)

62% (1974)

56% (1979)

70% (1979)

63% (1987)

0% (1980)

33% (1975)

64% (1980)

72% (1981)

59% (1986)