Year	%
2000	4.890049379550076
2001	4.721109508685006
2002	4.602780524263204
2003	4.430973948159185
2004	4.286658891704845
2005	4.17343531645627
2006	4.084581301981822
2007	4.033455689866572
2008	4.003935151411536
2009	3.918101135925004
2010	3.8440249461094553
2011	3.670177913059378
2012	3.5699025742269708
2013	3.506703997856874
2014	3.440918180200502
2015	3.3156295102657816
2016	3.232219493770605
2017	3.1213439382127626
2018	3.0381923973012643
2019	2.937117778559455
2020	2.80563123685699