Year	%
2000	3.02129531760647
2001	2.84008097319135
2002	2.61539779684704
2003	2.49892214660867
2004	2.37435874211397
2005	2.27968637736096
2006	2.19939652579737
2007	2.14544771567526
2008	2.12662317066421
2009	2.02358591475919
2010	1.83963241854498
2011	1.70367537262879
2012	1.56948080400445
2013	1.32538613867373
2014	1.33401002456024
2015	1.25807418337706
2016	1.02313827654853
2017	0.939429610553174
2018	0.853959901706019
2019	0.801593512169048
2020	0.641200717433824