62% (1969)

60% (1973)

59% (1969)

50% (1971)

71% (1969)

59% (1976)

55% (1970)

50% (1953)

69% (1972)

55% (1970)

69% (1975)

59% (1956)

70% (1955)

42% (1971)

50% (1978)

0% (1972)