Year	%
2002	4.11
2003	5.12
2004	5.22
2005	4.13
2006	4.06
2007	4.16
2008	4.17
2009	4.4
2010	4.78
2011	4.78
2012	4.21
2013	4.24
2014	3.84
2015	3.68
2016	3.68
2017	4
2018	3.98
2019	4.13
2020	3.92
2021	3.95