Year	%
2000	1.96495444742222
2001	2.0264432166618
2002	2.05184875550017
2003	2.09205896986166
2004	1.74082970607489
2005	1.75442013276273
2006	1.96362325451441
2007	2.18394895746898
2008	2.73990619625385
2009	3.38327640043593
2010	3.29678937211218
2011	3.33063694324967
2012	3.13363941283034
2013	2.75613838764623
2014	2.62264478781264
2015	2.46461901060093
2016	2.2850728914709
2017	2.20752466584746
2018	1.88921530279745
2019	1.99287089848341
2020	1.8147016716231