63% (1984)

59% (2008)

60% (2015)

69% (1959)

70% (1980)

66% (1996)

68% (1981)

66% (2000)

62% (1994)

65% (2000)

73% (1966)

64% (1990)

59% (1997)

71% (1970)

74% (1957)

67% (2006)

68% (1994)

60% (1998)

55% (1994)

64% (2002)