63% (1980)

48% (1972)

30% (1973)

48% (1974)

53% (1972)

30% (1971)

0% (1974)

20% (1971)

44% (1980)

20% (1977)

57% (1972)

42% (1973)

30% (1974)

28% (1972)

46% (1973)

54% (1977)

40% (1975)

0% (1976)

25% (1975)

20% (1971)