70% (1982)

65% (1988)

67% (1978)

69% (1983)

40% (2000)

68% (1979)

72% (1984)

72% (1981)

80% (1980)

52% (1970)

20% (1989)

45% (1980)

70% (1966)

66% (1976)

63% (1973)

64% (1987)

32% (1988)

50% (1990)

60% (1966)

40% (1979)