Page 9 of the report has Native American Disproportionality Rates by State. 21 states have overrepresentation of Native kids in care, including Michigan (1.3, and 1.9 in entries to care), Wisconsin (4.1), Minnesota (13.9)and Iowa (4.5). Michigan, Wisconsin, and Minnesota have worse numbers than 10 years ago (page 3).
Report Disproportionality Rates for Children of Color in Foster Care for Fiscal Year 2012 (pdf). Website here.
As a side note, anytime anyone would like to talk about what they think is happening in Illinois/Chicago (no disproportionality shown, almost no ICWA cases pop up on appeal, but with a large urban Native population), we are all ears.