63% (1980)

57% (1972)

48% (1972)

44% (1980)

30% (1973)

42% (1973)

28% (1972)

53% (1972)

20% (1971)

54% (1977)

10% (1980)

0% (1974)

30% (1971)

20% (1972)

48% (1973)

49% (1974)

20% (1971)

20% (1977)

0% (1976)

23% (1973)