71% (1973)

64% (1974)

65% (1975)

67% (1973)

70% (1974)

80% (1955)

52% (1971)

45% (1972)

62% (1975)

68% (1976)

65% (1977)

57% (1977)

58% (1968)

0% (1967)

60% (1972)

0% (1953)

60% (1965)

40% (1965)

0% (1961)

0% (1959)