Year	1=extremely inefficient to 7=extremely efficient
2007	4.14071785299223
2008	4.332139506025
2009	4.58481886707143
2010	4.5948058354
2011	4.475
2012	4.32777777777778
2013	4.31578947368421
2014	4.27777777777778
2015	4.32659866410087
2016	4.31764705882353
2017	4.45294117647059