Year	%
2000	22.15425643070663
2001	21.919959205571086
2002	22.035044743782834
2003	21.838488276661998
2004	21.315243860878457
2005	21.270355391347646
2006	20.212599196708066
2007	19.469330314245504
2008	19.17877184157914
2009	18.55171955575862
2010	18.19355768447956
2011	17.351440120462968
2012	16.742291461888417
2013	16.21943670293334
2014	16.597023932303944
2015	15.86196006531247
2016	15.845365035481894
2017	15.331178516428805
2018	15.20960720049154
2019	14.760771537493364