72% (1988)

50% (1981)

59% (1980)

68% (1980)

58% (1973)

62% (1986)

59% (1986)

0% (1980)

59% (1986)

75% (1993)

63% (1974)

61% (1973)

52% (1989)

48% (1979)

68% (1976)

64% (1977)

60% (1978)

63% (1972)

64% (1980)

39% (1971)