67% (1973)

64% (1974)

71% (1973)

65% (1975)

58% (1968)

60% (1972)

50% (1953)

51% (1973)

55% (1965)

70% (1973)

58% (1975)

0% (1973)

64% (1975)

52% (1971)

65% (1977)

0% (1959)

0% (1950)

0% (1953)

0% (1967)

0% (1976)