53% (2004)

60% (2004)

66% (1997)

71% (2003)

72% (1993)

72% (1992)

71% (1991)

65% (2003)

63% (2000)

64% (1995)

76% (2004)

74% (1996)

67% (1992)

72% (2004)

44% (1994)

66% (2000)

67% (1991)

69% (1997)

71% (1994)

60% (2001)