72% (1972)

60% (2004)

78% (1982)

62% (1999)

62% (1981)

66% (1992)

65% (2011)

60% (2006)

64% (1989)

63% (2001)

67% (1998)

65% (1978)

67% (1985)

54% (2017)

64% (1993)

59% (2016)

53% (2008)

71% (1974)

75% (1951)

54% (2001)