63% (1977)

61% (1971)

64% (1978)

74% (1987)

56% (2016)

64% (2005)

71% (2005)

72% (1992)

54% (2004)

58% (1993)

52% (2015)

60% (1975)

59% (1996)

54% (2000)

66% (2011)

71% (1994)

63% (1986)

65% (2006)

72% (2004)

56% (1967)