50% (1961)

0% (1962)

50% (1966)

50% (1968)

50% (1974)

0% (1976)

70% (1958)

0% (1973)

50% (1970)

60% (1979)

45% (1977)

10% (1955)

0% (1969)

0% (1974)

44% (1976)

0% (1957)

50% (1970)

35% (1979)

45% (1955)

0% (1958)