55% (1959)

50% (1974)

68% (2001)

67% (1986)

72% (1999)

62% (2012)

70% (1959)

66% (1994)

71% (2011)

51% (1967)

65% (2014)

80% (1950)

57% (1996)

76% (2005)

70% (2000)

65% (1999)

63% (2010)

40% (1976)

60% (1950)

68% (1966)