Year	%
1999	9.64
2000	9.6
2001	10.02
2002	5.06
2003	4.95
2004	4.96
2005	4.87
2006	4.91
2007	4.68
2008	4.57
2009	4.5
2010	4.32
2011	4.4
2012	4.4
2013	4.47
2014	4.03
2015	4.13
2016	3.98
2017	4.33
2018	3.84
2019	4.09
2020	4.03
2021	4.06