47% (1991)

61% (1985)

57% (1987)

67% (1980)

61% (1990)

61% (1988)

57% (1986)

59% (1985)

55% (1987)

59% (1990)

53% (1987)

65% (1983)

67% (1981)

57% (1991)

58% (1993)

59% (1989)

57% (1983)

61% (1993)

69% (1988)

56% (1982)