64% (1976)

75% (1973)

70% (1967)

69% (1963)

48% (1974)

20% (1979)

10% (1972)

52% (1975)

56% (1955)

62% (1971)

40% (1970)

62% (1956)

30% (1973)

51% (1955)

70% (1954)

53% (1974)

0% (1959)

70% (1958)

60% (1963)

55% (1969)