71% (2010)

64% (2011)

60% (2006)

44% (2011)

17% (2008)

25% (2006)

38% (2007)

33% (2009)

48% (2008)

17% (2005)

23% (2007)

67% (2004)

20% (2012)

47% (2005)

49% (2015)

55% (2008)

33% (2008)

38% (2012)

0% (1969)

60% (2011)