72% (2002)

52% (1997)

78% (1993)

50% (1984)

66% (2000)

60% (1986)

65% (1991)

70% (1990)

59% (1990)

58% (2004)

69% (1989)

63% (1992)

71% (1993)

55% (1994)

57% (1987)

48% (1985)

50% (1990)

54% (1991)

35% (1999)

65% (1991)