73% (2005)

64% (2005)

56% (2003)

53% (2004)

70% (2008)

60% (2008)

63% (2006)

61% (2006)

67% (2004)

58% (2008)

63% (2007)

55% (2009)

62% (2006)

55% (2007)

58% (2006)

48% (2007)

58% (2003)

67% (2005)

54% (2007)

0% (1970)