Descriptions of statistics often appear in newspapers and on news websites, and they can give you some useful language for writing task 1.
The example below comes from the Washington Post website.
The description on the website is inappropriate for IELTS because there is too much analysis of reasons why meat eating habits are changing - don't try to give reasons in your IELTS essay!
However, there are a few nice phrases that we can use e.g. Americans are projected to eat 12.2 percent less meat in 2012 than they did in 2007.
Maybe you can share your ideas for an IELTS-style description of this graph.