55% (1950)

60% (1962)

60% (2012)

57% (1966)

35% (1965)

50% (1963)

62% (2013)

35% (1961)

64% (2002)

50% (1975)

50% (1959)

60% (1962)

70% (2006)

48% (2004)

50% (1974)

70% (1974)

58% (1996)

59% (1985)

50% (1957)

73% (2016)