Mich. Comp. Laws § 18.1303

Sec. 303. (1) "Detroit consumer price index" means the most comprehensive index of consumer prices available for the Detroit area from the bureau of labor statistics of the United States department of labor or its successor. (2) "Open-end appropriation" means an annual appropriation without a specific sum, for a state budget purpose. (3) "Personal income" means as defined by the bureau of economic analysis of the United States department of commerce or its successor. (4) "Program" means the activities and financial resources applied to a public policy intention as approved by the legislature. (5) "Proportion" means the proportion of total state spending from state sources paid to all units of local government in a fiscal year, and shall be calculated by dividing a fiscal year's state spending from state sources paid to units of local government by total state spending from state sources for the same fiscal period.