Year	%
1997	15.62
2000	12.06
2001	12.09
2002	9.14
2003	9.03
2004	8.05
2005	7.3
2006	7.34
2007	6.95
2008	4.8
2009	7.03
2010	7.14
2011	3.79
2012	3.63
2013	3.68
2014	2.7
2015	2.69
2016	2.87
2017	2.95
2018	3.36
2019	3.36
2020	3.17
2021	3.3