Year	%
1997	16.31
2000	10.59
2001	10.6
2002	7.28
2003	6.94
2004	6.31
2005	6.05
2006	5.55
2007	5.36
2008	5.13
2009	4.94
2010	4.94
2011	4.95
2012	3.46
2013	3.46
2014	3.46
2015	3.44
2016	3.44
2017	3.37
2018	3.32
2019	3.32
2020	3.32
2021	3.32