56% (1975)

59% (1977)

40% (1979)

54% (1976)

44% (1974)

50% (1978)

50% (1973)

0% (1970)

60% (1971)

43% (1976)

50% (1966)

0% (1979)

0% (1972)

0% (1978)

0% (1964)