Year	%
2002	4.28
2003	4.98
2004	5.12
2005	4.3
2006	4.28
2007	3.68
2008	3.7
2009	4.28
2010	4.42
2011	4.42
2012	4
2013	4.1
2014	3.42
2015	3.37
2016	3.37
2017	4.22
2018	3.68
2019	3.47
2020	3.55
2021	3.53