Evolution of food prizes

This graphic reflects the evolution of  food prizes during the ages between 2006 and 2010.
It is based in a data published by FAO, and in this we can observe the ups and downs of the prizes.
We see for example that in 2007 the prize of food begans to increase but we see really a remarkable growth is at the beginning of 2008. After, the prizes of aliments declines in 2009 but finally in 2010 it increases again.