Prof. Pankaj Jalote, Director of IIIT-Delhi, has a study entitled ACM Survey of PhD Production in India in Computer Science. He also has a post highlighting his key findings and their implications.
Bottomline: About 125 PhDs graduated last year from Indian universities/institutions, and this number is likely to be about 250 in the year 2017-18. They face an excellent market for employment. A big surprise (at least for me): a large number of these PhDs -- 50 out of 125 -- are teaching in India.