The year 1921 is regarded as the defining .year or the ‘Year of Great Divide’, because prior to 1921, population growth in India was stagnant. India was in the first phase of demographic transition till 1921, that was characterised by high birth rate and high death rate. It implies low survival rate (or low life expectancy) which was nearly 8 per thousand people per annum. After 1921, India’s population growth never declined and showed a consistent upward trend.
Which year is regarded as the defining year to mark the demographic transition from its first to the second decisive stage?