Year	%
2000	4.428645909768606
2001	4.310401425507717
2002	4.20263010820986
2003	4.0250844177615575
2004	3.911779034368592
2005	3.8130917317106876
2006	3.7060415555580137
2007	3.654491881918123
2008	3.6301984664608042
2009	3.54728389246082
2010	3.46303640674566
2011	3.3047660130381455
2012	3.1895967202941975
2013	3.1136635169632623
2014	3.037882853368759
2015	2.9110773912751378
2016	2.825792218096194
2017	2.7454575249755395
2018	2.6674657843190714
2019	2.5806823245352764
2020	2.463393889163303