65% (1990)

70% (1992)

71% (1996)

75% (1999)

65% (1996)

10% (2004)

70% (2004)

50% (2004)

59% (2001)

68% (1991)

0% (1994)

50% (2002)

59% (1999)

64% (2004)

68% (1993)

66% (2001)

75% (2001)

67% (1997)

20% (2003)

67% (1997)