28% (1969)

70% (1970)

65% (1964)

64% (1963)

55% (1965)

48% (1964)

55% (1962)

43% (1960)

40% (1968)

48% (1959)

30% (1960)

32% (1969)

52% (1964)

30% (1954)

78% (1967)

40% (1963)

0% (1957)

52% (1966)

40% (1964)

50% (1961)