74% (1977)

64% (1973)

56% (1985)

63% (1987)

68% (1981)

68% (1978)

50% (1984)

36% (1983)

55% (1974)

70% (1981)

67% (1985)

50% (1977)

59% (1976)

60% (1982)

45% (1987)

35% (1978)

62% (1986)

65% (1972)

33% (1980)

57% (1978)