Question: In 1930s how many indentured children were there?
Sentence: Swiss municipality guardianship authorities acted so, commonly tolerated by federal authorities, to the 1960s, not all of them of course, but usually communities affected of low taxes in some Swiss cantons Swiss historian Marco Leuenberger investigated, that in 1930 there were some 35,000 indentured children, and between 1920 and 1970 more than 100,000 are believed to have been placed with families or homes.
Answer in sentence: yes