The small problem with statistics is that you need the story of how the statistic was created to have it say anything sensible. Without the story a graph is just a pretty picture with which you can make people believe anything. What you need as an addition is a written in law way of how the statics are calculated.
Just making statistics a prerequisite for making a decision will prompt those in power to make the numbers look in their favour.
It's not 4200/month if she's only making 340/month after tax...