71% (1967)

75% (1973)

64% (1976)

30% (1979)

70% (1958)

51% (1955)

30% (1973)

20% (1970)

10% (1972)

62% (1956)

0% (1959)

52% (1975)

69% (1963)

59% (1958)

70% (1954)

60% (1958)

55% (1969)

40% (1970)

48% (1974)

45% (1959)