At the difference of how many years the census is conducted in India?

Census in India is conducted every 10 years starting from 1872. The post-1949 census has been conducted by the Registrar General and Census Commissioner of India under Ministry of Home Affairs, Government of India. Since 1959 the census is conducted under 1949 Census of India Act. Currently, the census has been conducted 15 times, in which 8 times is pre Independence and 7 times in post Independence. Nest census is to be held on 2021.