It's a difficult topic to find real stats on, results tend to be skewed one way or the other depending on the politics of the source. Most of my knowledge on the topic is from industry professionals and documentaries. Basically due to the harsh chemicals over half of all leather is produced in India, and conditions are not great for either party.

https://www.independent.co.uk/news/world/asia/how-india-s-sacred-cows-are-beaten-abused-and-poisoned-to-make-leather-for-high-street-shops-724696.html