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Further complexity is lent by the great variation that occurs across this population on social parameters such as income and education.
Source: but recognises many of the tribal groups as Scheduled Castes and Tribes (see list of Scheduled Tribes in India).
The largest of these is Hindi with some 337 million, and the second largest is Bengali with 238 million. In India, there are 1,652 languages and dialects in total.
India is projected to overtake China as the world's most populous nation by 2030.
The 2011 census birth sex ratio in India, of 917 girls to 1000 boys, is similar to 870–930 girls to 1000 boys birth sex ratios observed in Japanese, Chinese, Cuban, Filipino and Hawaiian ethnic groups in the United States between 19.
They are also similar to birth sex ratios below 900 girls to 1000 boys observed in mothers of different age groups and gestation periods in the United States.
Studies of India's population since 1881 have focused on such topics as total population, birth and death rates, growth rates, geographic distribution, literacy, the rural and urban divide, cities of a million, and the three cities with populations over eight million: Delhi, Greater Mumbai (Bombay), and Kolkata (Calcutta).