70% (1931)

52% (1981)

56% (1998)

63% (1936)

52% (1943)

64% (1970)

44% (1980)

56% (1945)

56% (1969)

59% (1987)

49% (1951)

79% (1999)

67% (1941)

70% (2012)

62% (2001)

52% (1965)

57% (1972)

42% (1939)

70% (1946)

62% (1965)