At the same time, the percentage of people who were either immigrants or had at least one parent who was an immigrant fell from 46% to 37%. This was more a reflection of the fact that the residents of Warren and East Detroit at the time were in many cases literally the children and grandchildren of the residents of north-east Detroit and Hamtramck. Those born in Poland or with at least one parent born there fell from 12% to 9% of the population, the same group for Canadians fell from 7% to 6% the Italian group held steady at 6% while the German group actually rose from 4% to 6%. Since all these figures are based on the 1970 census, the changes reflect differences between the areas added and dropped, not any population movement.