Year	%
2000	23.998166940692197
2001	23.72368346365935
2002	23.619170110476244
2003	23.41656710009682
2004	22.968227656486704
2005	22.66560845173769
2006	22.27464880269992
2007	22.005553863707306
2008	21.839607188702736
2009	21.60150080065962
2010	21.50650234777475
2011	21.28866654482044
2012	21.023104507042333
2013	20.48419901718386
2014	20.1103766447907
2015	20.09045947666406
2016	19.972614023773698
2017	19.662208401878555
2018	19.456131345300594
2019	19.315775500654162