Year	%
2000	36.283164157270384
2001	35.881848925358106
2002	35.644338037092886
2003	35.4347543308557
2004	35.13269610063415
2005	34.80564766044405
2006	34.45603968602563
2007	34.14145412118412
2008	33.759667280285925
2009	33.30979410637983
2010	32.963614766161946
2011	32.601449318052516
2012	32.388002039058456
2013	32.269814978852146
2014	32.08113660768168
2015	31.775380113911158
2016	31.598694244824955
2017	31.482749090265333
2018	31.402577325653667
2019	31.368604429367057