Year	%
1997	14.41
2000	11.65
2001	11.28
2002	8.35
2003	8.17
2004	7.34
2005	7.36
2006	6.61
2007	5.86
2008	5.14
2009	4.9
2010	4.87
2011	4.59
2012	3.54
2013	3.69
2014	3.69
2015	3.58
2016	3.53
2017	2.66
2018	3.16
2019	3.16
2020	3.32
2021	3.32