68% (1989)

67% (1981)

70% (1985)

59% (1989)

55% (1991)

49% (1992)

63% (1986)

57% (1986)

49% (1993)

50% (1987)

60% (1980)

47% (1979)

48% (1995)

49% (1994)

58% (1978)

54% (1995)

47% (1987)

56% (1989)

65% (1984)

62% (1988)