78% (1999)

52% (1993)

57% (2001)

48% (1991)

66% (1993)

74% (2003)

59% (1990)

50% (1992)

51% (1988)

64% (1984)

10% (1987)

70% (1988)

0% (1970)

0% (1992)

50% (1987)