(1) 1921-1931 Explanation: The year 1921 marked the start of consistent population growth as revealed by the census. It was preceded by a decadal decline in growth rate during 1911-1921 which saw a net decrease of 0.3 per cent for the century as a whole. The year 1921 turned out to be demographic divide as in the post-1921 period; the population began to show signs of steady increase.