Year	%
2000	4.27197221496418
2001	3.99056148128981
2002	3.80111304844985
2003	3.55246280439694
2004	3.35076174096007
2005	3.19715690579246
2006	3.13719489267843
2007	3.25938419376113
2008	3.48840280629875
2009	3.0444180986582
2010	2.69226684211918
2011	2.55638314099674
2012	2.08123443245283
2013	2.14615474705026
2014	1.99939545474273
2015	1.87818374394505
2016	1.60069638875743
2017	1.51152547546943
2018	1.44131428330072
2019	1.41530270790314
2020	1.21080201006308