52% (1980)

56% (1979)

58% (1978)

52% (1982)

53% (1986)

76% (1982)

72% (1983)

51% (1988)

65% (1989)

54% (1977)

0% (1986)

42% (1994)

67% (1977)

37% (1983)

20% (1990)

0% (1977)

44% (1981)

62% (1985)

0% (1987)

64% (1990)