78% (1978)

50% (2011)

76% (2015)

56% (1962)

55% (1992)

73% (2006)

55% (1994)

79% (1982)

100% (1968)

38% (1965)

70% (2005)

70% (1996)

70% (1983)

54% (1972)

78% (2005)

75% (1970)

75% (2010)

80% (2000)

75% (1947)

79% (2001)