55% (1955)

55% (1973)

57% (2007)

45% (1970)

40% (1990)

79% (1952)

54% (1960)

53% (1966)

73% (1967)

64% (1956)

48% (1989)

51% (1956)

60% (1950)

49% (1973)

50% (1969)

56% (1940)

63% (1950)

40% (1990)

50% (1963)

50% (1959)