72% (2005)

64% (2005)

57% (2003)

70% (2008)

59% (2003)

68% (2004)

64% (2007)

56% (2009)

53% (2004)

58% (2008)

62% (2006)

63% (2006)

58% (2007)

55% (2007)

60% (2008)

53% (2007)

62% (2006)

48% (2007)

0% (1970)