Year	%
2000	7.44222356024858
2001	6.50146424949607
2002	6.15022658283611
2003	5.95309744257472
2004	5.47101466482882
2005	5.29284160971464
2006	4.7663072732025
2007	4.6136753799637
2008	4.6057282480751
2009	4.15903110273031
2010	4.12764748502915
2011	3.99527913581932
2012	3.96134020638693
2013	3.64067256385418
2014	3.6009449296073
2015	3.51051745416855
2016	3.10392846183506
2017	3.2550969242469
2018	2.78532945200309
2019	3.05093223241537
2020	3.12417568630982