Year	%
2000	17.567820589227566
2001	17.294641264141525
2002	17.115437227367547
2003	17.028945302192582
2004	16.950043490158663
2005	16.893869268889095
2006	16.829232995242425
2007	16.795380629976396
2008	16.732697936195063
2009	16.702794630419017
2010	16.629586871034245
2011	16.68654842740123
2012	16.73969777831221
2013	16.864050479341824
2014	16.97804596789172
2015	17.128257551149527
2016	17.29332541747874
2017	17.46074918647122
2018	17.61051537800156
2019	17.7494354754638