Year	%
2000	21.1290123640273
2001	20.778300943858387
2002	20.53057118933543
2003	20.4243645225001
2004	20.118002976360604
2005	19.588217363697822
2006	19.303170973046083
2007	19.192864724383817
2008	19.083869379800674
2009	18.864401923705152
2010	18.683336130818198
2011	18.454161094630383
2012	18.2630585597822
2013	17.995381979453168
2014	17.843515585912485
2015	17.824985794288885
2016	17.956952302859946
2017	17.48925155202448
2018	17.28209808701239
2019	17.033837222501678