68% (2015)

62% (2018)

67% (2010)

56% (2005)

61% (2004)

62% (2008)

58% (1999)

54% (2006)

65% (2002)

51% (2008)

42% (2005)

0% (1970)

50% (2011)

66% (2012)

57% (2006)

0% (2010)

53% (2010)

0% (2012)