63% (1990)

52% (1988)

50% (2002)

70% (2002)

58% (1984)

50% (1993)

70% (1997)

55% (1985)

85% (1973)

68% (1993)

70% (1987)

67% (2002)

56% (1998)

65% (1986)

0% (1969)

71% (1999)

95% (1998)

54% (1999)

0% (1979)

65% (2006)