73% (1988)

59% (1986)

65% (1986)

59% (1986)

68% (1976)

100% (1990)

64% (1977)

52% (1989)

64% (1980)

56% (1979)

75% (1993)

62% (1978)

62% (1973)

62% (1974)

63% (1972)

58% (1973)

63% (1974)

0% (1980)

68% (1980)

70% (1979)