68% (2020)

60% (2006)

54% (2011)

67% (2000)

59% (1999)

65% (1994)

77% (1963)

56% (1998)

68% (1982)

64% (1981)

59% (2009)

65% (2008)

64% (2005)

57% (1996)

67% (2006)

69% (1998)

66% (1971)

63% (2014)

56% (1996)

48% (2000)