72% (1971)

57% (2002)

71% (2000)

67% (1991)

64% (1981)

29% (2009)

67% (1966)

61% (1994)

67% (1985)

76% (1944)

77% (1961)

65% (1958)

67% (1982)

54% (2001)

64% (2005)

64% (2013)

60% (2015)

69% (1937)

65% (1966)

64% (1944)