Year	%
2000	3.7539140866341114
2001	3.645943953828066
2002	3.5385776016740604
2003	3.344144187139219
2004	3.2139495959549764
2005	3.106450681257707
2006	2.968437685013973
2007	2.9029260840889815
2008	2.858234226283585
2009	2.72661394904646
2010	2.5920661310835906
2011	2.464576394034778
2012	2.304515337688609
2013	2.200975261997601
2014	2.098318947608511
2015	2.0034336379703683
2016	1.8984487822404372
2017	1.8266342820263415
2018	1.7330074916665827
2019	1.673022602372439
2020	1.6168702116177047