62% (1982)

60% (1980)

78% (1983)

73% (1994)

66% (1990)

63% (1981)

59% (1984)

68% (1985)

61% (1977)

56% (1992)

61% (1985)

56% (1979)

38% (1986)

42% (1986)

0% (1994)

20% (1991)

65% (1988)

69% (1987)

63% (1988)

40% (1998)