Explanation:

• The exodus of migrant workers from the cities following the announcement of the 21-day lockdown threw the spotlight on the vast number of Indians who live outside their home states.
• The total number of internal migrants in India, as per the 2011 census, is 45.36 crore or 37% of the country’s population. This includes inter-state migrants as well as migrants within each state, while the recent exodus is largely due to the movement of inter-state migrants.
• The highest influx of migrants within the country is seen in city-districts such as Gurugram, Delhi and Mumbai along with Gautam Buddh Nagar (Uttar Pradesh); Indore, Bhopal (Madhya Pradesh); Bangalore (Karnataka); Thiruvallur, Chennai, Coimbatore (Tamil Nadu). 
• Uttar Pradesh and Bihar account for the origin of 25 per cent and 14 per cent of the total inter-state migrants, followed by Rajasthan and Madhya Pradesh, at 6 per cent and 5 per cent. This means that around 4-6 million people would be wanting to return to Uttar Pradesh, and 1.8-2.8 million to Bihar. Another 700,000 to 1 million would be wanting to return to Rajasthan and 600,000-900,000 to Madhya Pradesh