Year	%
1998	3.16
1999	2.86
2000	3.05
2001	4.08
2002	5.38
2003	5.58
2004	4.36
2005	4.48
2006	13.67
2007	12.22
2008	11.01
2009	11.33
2010	11.75
2011	10.3
2012	9.94
2013	10.37
2014	9.31
2015	10.14
2016	9.47
2017	8.44
2018	7.7
2019	7.98
2020	5.59
2021	6.54