75% (1984)

50% (1971)

10% (1975)

15% (1974)

10% (1973)

25% (1971)

33% (1973)

10% (1970)

30% (1969)

40% (1981)

38% (1971)

30% (1973)

35% (1978)

35% (1974)

72% (1969)

46% (1972)