45% (2004)

60% (2000)

72% (1994)

49% (2001)

55% (1998)

65% (1996)

75% (1993)

46% (2003)

62% (1990)

55% (1995)

70% (2004)

69% (2001)

60% (2006)

66% (1997)

68% (1997)

75% (1999)

72% (2003)

67% (1997)

72% (2003)

75% (2002)