68% (1989)

70% (1985)

54% (1991)

67% (1981)

63% (1986)

58% (1989)

65% (1984)

50% (1992)

49% (1994)

57% (1986)

48% (1995)

56% (1989)

63% (1989)

47% (1987)

54% (1995)

62% (1988)

47% (1979)

55% (1987)

58% (1978)

60% (1987)