75% (2006)

72% (2007)

67% (2006)

71% (2001)

54% (2006)

52% (2006)

66% (1997)

58% (1994)

62% (2008)

70% (2002)

62% (1993)

72% (1994)

49% (2007)

67% (2002)

67% (2001)

43% (1999)

63% (2005)

52% (2004)

58% (2003)

65% (1997)