50% (1972)

69% (2013)

59% (2013)

67% (2009)

55% (2006)

57% (2005)

68% (2007)

63% (2008)

66% (2005)

64% (2008)

67% (2005)

64% (2004)

59% (2009)

54% (2008)

40% (2006)

60% (2001)

56% (2007)

52% (2006)

60% (2006)

50% (2004)