Year	scale 0 - 100
2004	81.18518533333334
2005	83.03703711111112
2006	83.11111111111111
2007	82.81481511111112
2008	82.81481422222221
2009	82.60869499999998
2010	83.07971065217392
2011	82.24637695652173
2012	81.59420326086956
2013	80.57971014492755
2014	79.85507246376812
2015	82.41137872340428
2016	81.56030638297875
2017	83.97164680851067
2018	84.89363191489362
2019	84.18441063829786
2020	81.48937872340427