Year	%
1999	8.47
2000	8.45
2001	8.42
2002	5.48
2003	5.41
2004	5.41
2005	4.53
2006	4.49
2007	4.17
2008	4.12
2009	4.34
2010	5.22
2011	4.27
2012	4.27
2013	4.06
2014	3.75
2015	3.59
2016	3.6
2017	4.08
2018	3.36
2019	3.68
2020	3.59
2021	3.6