The growth rate of the Muslim population has consistently declined or remained constant since 1971 till 2011, with the only exception being the 10-year period ended 1991.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/indias-population-121-billion-hindus-798-muslims-142
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/population
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/religious-beliefs
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/census-2011
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/people