68% (1999)

64% (2008)

66% (2005)

65% (2003)

52% (2012)

67% (2005)

68% (2006)

48% (1960)

60% (1971)

49% (2006)

20% (1994)

55% (1983)

67% (1974)

60% (1964)

57% (2007)

67% (1977)

58% (1996)

56% (1997)

0% (1990)

0% (2001)