Year	%
1999	12.67
2000	11.87
2001	7.41
2002	6.45
2003	6.44
2004	6.4
2005	5.75
2006	5.47
2007	7.6
2008	6.35
2009	5.53
2010	5.69
2011	3.16
2012	3.16
2013	3.5
2014	2.51
2015	3.93
2016	3.83
2017	21.65
2018	16.63
2019	4.37
2020	1.35
2021	1.47