55% (2006)

60% (2013)

56% (2005)

70% (2013)

64% (2008)

67% (2007)

67% (2009)

58% (2006)

64% (2004)

50% (1972)

64% (2008)

65% (2005)

59% (2006)

59% (2009)

51% (2004)

54% (2008)

53% (2006)

57% (2007)

60% (2001)

45% (2005)