55% (2017)

63% (2005)

54% (1993)

64% (1985)

57% (1984)

60% (1978)

67% (1969)

58% (2018)

64% (2008)

63% (1989)

75% (2015)

63% (1955)

56% (2013)

70% (1972)

57% (2005)

66% (2010)

70% (2014)

59% (1987)

62% (1983)

58% (2017)