https://www.statista.com/chart/22192/consumer-attitudes-products-made-in-india/

Exact data on the subject is hard to come by, primarily because the 1961 census was the last one to look at marriages by religion and community. That survey, in fact, found that incidence of polygamy was the least among Muslims, with just 5.7% of the community likely to practice it. Hindus actually had a higher incidence rate of polygamy, at 5.8%, although other communities, including Buddhists and Jains, were proportionally even more likely to practice polygamy. At the top were tribals, 15.25% of whom were polygamous. -Mohan Guruswamy