Year	%
2000	3.5416407058233
2001	3.11815769644736
2002	3.12725049217549
2003	2.9664730822853
2004	2.89312667462995
2005	2.73839357321692
2006	2.59394781035061
2007	2.53325568678509
2008	2.61576371819873
2009	2.52010726834147
2010	2.4145675296308
2011	2.24760589127404
2012	1.98848465548458
2013	1.78830458486981
2014	1.75126300325558
2015	1.62970706281221
2016	1.33254589742733
2017	1.32305505390004
2018	1.31977022558895
2019	1.22845405741754
2020	1.24471917984198