63% (2001)

77% (2004)

70% (2006)

68% (2010)

74% (1998)

68% (1999)

66% (2008)

60% (1996)

67% (2001)

67% (2010)

70% (1992)

66% (2004)

68% (2004)

62% (2009)

39% (2006)

58% (2003)

53% (1998)

54% (2004)

63% (1998)

66% (1995)