63% (1987)

75% (1977)

64% (1973)

56% (1985)

55% (1974)

45% (1987)

68% (1978)

68% (1981)

70% (1981)

50% (1984)

52% (1975)

59% (1976)

68% (1985)

33% (1980)

65% (1972)

60% (1982)

36% (1983)

35% (1978)

62% (1986)

50% (1977)