72% (1988)

50% (1981)

59% (1980)

62% (1986)

68% (1980)

59% (1986)

58% (1973)

52% (1989)

59% (1986)

64% (1977)

0% (1980)

75% (1993)

61% (1973)

48% (1979)

68% (1976)

60% (1978)

63% (1974)

63% (1972)

55% (1980)

64% (1980)