Year	%
2000	4.80524519320894
2001	4.37018283894464
2002	4.50050687266743
2003	4.48438015806446
2004	4.34507059101073
2005	4.19475263646788
2006	4.03195380634209
2007	4.07968860962045
2008	3.90584151588523
2009	3.79623268009416
2010	3.42964227911815
2011	3.31543482593697
2012	3.20564758576395
2013	3.32723085750071
2014	2.84924963159325
2015	2.80433725925938
2016	2.65789588823686
2017	2.43250679902797
2018	2.51826821906983
2019	2.34615557212403
2020	2.11446422286022