Year	%
2000	2.80511097455995
2001	2.92178828834598
2002	3.05800600107099
2003	3.17023726756355
2004	2.98449726032561
2005	3.01706925757061
2006	3.2633351273884
2007	3.12445807620308
2008	3.13732531642229
2009	3.31944032597306
2010	3.05888242976036
2011	3.00238234855007
2012	3.04545482174572
2013	2.96433309668988
2014	2.64347993055665
2015	2.55612178336225
2016	2.59241397685221
2017	2.48249738575918
2018	2.53422905833567
2019	2.19317305679451
2020	2.18571185497155