Year	%
2000	0.7991571444897791
2001	0.7651113658502932
2002	0.7303408747564197
2003	0.7114431368186002
2004	0.6806541090744552
2005	0.6429505799437657
2006	0.6009752639654505
2007	0.5724499417253537
2008	0.5581311901340602
2009	0.5522813120235616
2010	0.4933257772081582
2011	0.46772353736878586
2012	0.4456643455154136
2013	0.4108105191070944
2014	0.37642345934000854
2015	0.34653050108919226
2016	0.31897276492798904
2017	0.3007706584437034
2018	0.2927545289693596
2019	0.2806747104422992
2020	0.2755958535698916