India's Economic Survey: Human Development Indicator, 2017-18
1. Literacy rates for 1951, 1961 and 1971 Censuses relate to population aged five years and above and from 1981 onwards literacy rates relate to the population aged seven years and above. The literacy rate for 1951 in case of West Bengal relates to total population including 0-4 age group. Literacy rate for 1951 in respect of Chhatisgarh, Madhya Pradesh and Manipur are based on sample population.
2. Arunachal Pradesh Census conducted for the first time in 1961
3. India and Manipur figures includes estimated population for those of the three sub-divisions viz. Mao Maram, Paomata and Purul Senapati district of Manipur as census results of 2001 in these three sub-divisions were cancelled due to technical and administrative reasons.