Year	%
2000	4.54
2001	4.6
2002	4.77
2003	4.53
2004	4.26
2005	4.26
2006	4.25
2007	4.03
2008	4.03
2009	4.02
2010	4.22
2011	4.21
2012	4.2
2013	4.19
2014	4.18
2015	4.19
2016	4.13
2017	4.14
2018	4.12
2019	4.1
2020	3.96
2021	2.83