Year	%
2000	21.23747126476468
2001	20.826392396594898
2002	20.629307401966607
2003	20.470085762562466
2004	20.198931314992347
2005	19.665277407779886
2006	19.39590665741739
2007	19.246720198757597
2008	19.149640395047182
2009	18.921810585478884
2010	18.74973357771592
2011	18.46312696593361
2012	18.291150574966398
2013	18.03298355404934
2014	17.8766202938549
2015	17.90635115736783
2016	18.077130133055373
2017	17.647525222953497
2018	17.473624184935538
2019	17.273675920425653