45% (2004)

59% (2000)

55% (1998)

72% (1994)

75% (1993)

54% (1995)

66% (1997)

75% (2000)

69% (2001)

70% (2004)

68% (1997)

61% (1990)

71% (1996)

59% (2006)

49% (2001)

65% (1996)

76% (2001)

59% (2004)

68% (1997)

72% (1997)