Year	%
1999	9.64
2000	9.6
2001	10.02
2002	5.06
2003	4.95
2004	4.96
2005	4.18
2006	3.91
2007	3.34
2008	3.46
2009	3.24
2010	4.32
2011	3.14
2012	3.14
2013	3.88
2014	3.1
2015	2.88
2016	2.69
2017	3.58
2018	1.66
2019	2.73
2020	2.73
2021	2.85