72% (2005)

60% (2008)

63% (2005)

58% (2008)

61% (2006)

55% (2009)

56% (2003)

63% (2006)

68% (2004)

70% (2008)

68% (2005)

56% (2007)

58% (2006)

55% (2007)

48% (2007)

53% (2004)

64% (2007)

62% (2006)

58% (2003)

0% (1970)