73% (2011)

68% (1997)

70% (1976)

78% (1969)

50% (1995)

66% (1992)

52% (1959)

71% (1994)

30% (1964)

72% (1991)

81% (1964)

72% (1994)

64% (1995)

70% (1993)

72% (1966)

85% (1984)

70% (2011)

72% (2016)

79% (1998)

42% (2003)