52% (1988)

63% (1990)

58% (1984)

70% (2002)

67% (2002)

50% (2002)

54% (1999)

40% (1998)

70% (1997)

65% (1986)

55% (1985)

71% (1999)

73% (2003)

0% (1990)

95% (1998)

80% (1987)

68% (1993)

0% (1980)

65% (2006)

70% (1987)