Year	%
2000	36.283164157270384
2001	35.88184892535809
2002	35.644338037092886
2003	35.434754330855704
2004	35.132696100634156
2005	34.80564766044405
2006	34.45603968602564
2007	34.141454121184125
2008	33.75966728028593
2009	33.309794106379826
2010	32.963614766161946
2011	32.601449318052516
2012	32.388002039058456
2013	32.26981497885214
2014	32.08113660768168
2015	31.775380113911165
2016	31.598694244824962
2017	31.482749090265326
2018	31.40257732565366
2019	31.368604429367057