58% (1986)

67% (1980)

61% (1985)

56% (1987)

65% (1983)

61% (1990)

59% (1993)

62% (1988)

57% (1991)

53% (1987)

47% (1991)

56% (1982)

56% (1983)

67% (1981)

69% (1988)

48% (1992)

62% (1993)

58% (1990)

44% (1988)

57% (1987)