45% (1980)

60% (1972)

45% (1969)

64% (1970)

65% (1969)

50% (1969)

39% (1973)

64% (1968)

57% (1966)

52% (1969)

68% (1968)

48% (1965)

59% (1961)

54% (1968)

63% (1967)

42% (1981)

60% (1968)

45% (1970)

49% (1966)

60% (1967)