68% (1989)

67% (1981)

69% (1985)

50% (1992)

65% (1984)

54% (1991)

49% (1994)

57% (1986)

58% (1989)

49% (1995)

64% (1989)

54% (1995)

62% (1988)

62% (1986)

47% (1987)

60% (1980)

49% (1993)

58% (1978)

47% (1979)

54% (1992)