72% (1987)

68% (1986)

69% (1998)

65% (1984)

69% (1990)

60% (1985)

68% (1987)

58% (1998)

67% (1987)

63% (1994)

67% (1990)

57% (1988)

64% (1985)

49% (1987)

68% (1992)

61% (1996)

45% (1989)

66% (1987)

53% (1988)

61% (1987)