Year	%
1999	10.12
2001	9.67
2002	10.7
2003	9.44
2004	9.43
2005	8.21
2006	8.32
2007	1.49
2008	1.39
2009	1.33
2010	1.38
2011	2.18
2012	1.9
2013	1.89
2015	1.67
2016	1.88
2020	1.74
2021	3