75% (2006)

72% (2007)

67% (2006)

71% (2001)

53% (2006)

43% (1999)

71% (1994)

54% (2006)

63% (2005)

58% (1994)

49% (2007)

67% (2002)

62% (1993)

66% (2002)

62% (2008)

52% (2003)

63% (2005)

39% (1991)

60% (2009)

66% (1997)