very good software for simulations on econ, social etc. indicators

http://www.gapminder.org/   ->  "GAPMINDER WORLD"

to find out how to use it and look at example:

http://www.ted.com/talks/lang/en/hans_rosling_at_state.html

and for a simple usage, which also has different and interesting info. :

http://www.gapminder.org/downloads/human-development-trends-2005/