Year	%
2000	17.717615930235183
2001	17.227721385760006
2002	16.93747359415823
2003	16.637047089025632
2004	16.05745992276658
2005	15.746738833876357
2006	15.346065173932717
2007	15.066362329462933
2008	14.85541506052351
2009	14.544386969097584
2010	14.143853199848051
2011	13.932797112027849
2012	13.831672034636844
2013	13.630290074595104
2014	13.529468678612155
2015	13.519504539578744
2016	13.61902479323134
2017	13.407656990708935
2018	13.195469635631321
2019	13.172295746268878