https://www.populationfoundation.in/cool_timeline/1970s/https://www.populationfoundation.in/cool_timeline/1980s/https://www.populationfoundation.in/cool_timeline/1990s/https://www.populationfoundation.in/cool_timeline/2000s/https://www.populationfoundation.in/cool_timeline/2010s/https://www.populationfoundation.in/cool_timeline/2020s/