Year	%
1997	16.85
2000	11.74
2001	11.7
2002	8.39
2003	8.19
2004	7.3
2005	6.34
2006	6.35
2007	5.67
2008	2.44
2009	5.71
2010	5.78
2011	2.15
2012	1.65
2013	1.67
2014	1.25
2015	1.24
2016	1.44
2017	1.22
2018	1.47
2019	1.47
2020	1.45
2021	1.61