S-curves and normal

One of my projects that I did was about smartphones being sold over the years. I thought that this was one of the best projects I have done. I made this project into a video and put it on YouTube. This graph below is a graph I created which tells me the number of total phones sold between the years of 2008 and 2013.
I also talked about market penetration for Android. Market penetration is the extent to which a product is recognized and bought by customers in a particular market.  Duopoly which is a situation in which 2 suppliers dominate the market for a commodity or service.  I also mention a little bit about The Diffusion of Innovations Theory.

This video below explains the video that I made out this project.:

This graph shows smartphone sales\

These are the sources:
https://plus.google.com/103621071758334067066/posts/6dAeYAFUZaN
http://www.ospmag.com/osp-central/ospcentralfeature/worldwide-mobile-device-sales-end-users-reached-16-billion-units-2010-
http://appleinsider.com/articles/10/02/23/gartner_apples_iphone_was_no_3_worldwide_smartphone_in_2009