Year	%
1997	15.94
2000	10.56
2001	10.57
2002	7.36
2003	7.03
2004	6.26
2005	5.95
2006	5.55
2007	5.38
2008	5.21
2009	4.99
2010	4.99
2011	4.99
2012	3.8
2013	3.8
2014	3.8
2015	3.78
2016	3.78
2017	3.74
2018	3.7
2019	3.7
2020	3.7
2021	3.71