Year	scale 0 - 100
2004	78.6928104901961
2005	80.71888882352941
2006	80.915
2007	80.71190932038837
2008	80.80899640776698
2009	80.85707923809528
2010	81.82533380952378
2011	82.2222221904762
2012	81.65079342857143
2013	79.98442367601243
2014	79.11526479750775
2015	80.9259564814815
2016	81.45064166666668
2017	83.11729722222223
2018	83.73459074074079
2019	82.80866296296298
2020	81.38891018518525