53% (1983)

73% (1976)

57% (2010)

59% (1993)

71% (1969)

69% (2003)

61% (1981)

62% (1966)

65% (2007)

75% (1948)

61% (2001)

46% (2015)

59% (2016)

63% (2014)

40% (2014)

47% (2015)

57% (2013)

59% (2012)

67% (2012)

55% (2010)