With reference to the demographic profile of India, consider the following statements:
- The proportion of the population in the age group 0-6 declined from 16% to 13% over the period 2001-11.
- Of all the states, 20 states have achieved replacement level fertility.
- As per 2011 census, there has been a significant inflow of migration to many southern states.
Which of the statements given above is/are correct?