45% (2004)

59% (2000)

54% (1998)

72% (1994)

70% (1992)

75% (1993)

65% (1996)

67% (2001)

67% (1997)

64% (1996)

63% (2006)

75% (1999)

59% (2002)

67% (2003)

68% (1991)

47% (2004)

75% (2000)

60% (1999)

72% (1997)

66% (1997)