Year	scale 0 - 100
2004	80.6837608974359
2005	82.26487192307692
2006	82.60679499999999
2007	81.98303797468354
2008	82.02523164556959
2009	81.85176925925927
2010	82.11925975308641
2011	82.67489728395061
2012	82.13991765432098
2013	80.2439024390244
2014	79.55691056910567
2015	80.80323975903616
2016	81.76708433734942
2017	83.53414457831326
2018	84.13656626506027
2019	83.29319397590363
2020	81.92773253012054