50% (1972)

55% (2006)

70% (2013)

57% (2005)

60% (2013)

67% (2007)

66% (2005)

64% (2008)

67% (2009)

64% (2004)

63% (2008)

54% (2008)

51% (2004)

59% (2009)

67% (2005)

59% (2001)

40% (2006)

59% (2006)

48% (2006)

60% (2006)