68% (2017)

58% (1997)

60% (2012)

46% (1991)

43% (2003)

51% (1970)

58% (2009)

35% (1986)

70% (2004)

33% (1998)

0% (1961)

0% (2008)

41% (2006)

30% (1947)

56% (2005)

53% (2005)

44% (2009)

63% (2008)

50% (2011)

70% (1951)