Year	%
2000	4.22
2001	4.83
2002	4.27
2003	4.77
2004	4.68
2005	4.54
2006	4.19
2007	3.99
2008	3.7
2009	4.28
2010	3.84
2011	3.53
2012	3.13
2013	3.37
2014	3.46
2015	3.48
2016	3.64
2017	3.11
2018	3.04
2019	2.65
2020	2.14
2021	3.45