If you have ever wondered how things evolved or changed across time in any country….
For instance, How is Per Capita income related with Life expectancy in India ? Have a look at below
It gives you complete view. You can see the progress of the trend if you click on Play from 1800s
There are many cool things on the website. It is very popular for educational purposes and the data is very much valid. Have a peek at this site. You will find it very exicitng to know the trends and get to know world better !
Website : http://www.gapminder.org/
You have to click on Explore the world, for all the cool graphs and trend or you can directly click here