It was a long drawn-out process in Michigan to limit assessment increases. In 1978 a voter initiative was adopted that limited aggregate property tax assessment increases in an area to the rate of inflation.
That meant, in a given city or other entity, the total property tax assessment for already-standing property could only go up at the rate of inflation. The problem was that businesses usually had the resources to fight any major assessment increases, so they'd get a token 1% increase and the average property owner would see a 5% increase.
As part of a school finance reform proposal pushed by then-Governor Engler in 1994, one of the components was a COLA limit on increases in property tax assessments by individual parcel. That proposal (which raised the sales tax and cut property taxes as well) was adopted by Michigan voters, so the COLA limit on each property has been in place ever since. It's very useful for financial planning to know that your property tax increases year to year are limited.