85% (1999)

75% (1997)

73% (1986)

63% (1980)

58% (2000)

69% (2015)

61% (2000)

73% (2003)

64% (1999)

68% (1998)

71% (1998)

68% (1969)

65% (2012)

61% (2001)

58% (1994)

67% (2000)

62% (1977)

70% (1970)

59% (1999)

68% (1970)