Year	%
1991	19.94
1993	9.84
1996	6.87
1997	6.56
1998	6.25
1999	5.94
2000	5.57
2001	4.18
2002	4.18
2003	4.18
2004	4.18
2005	3.47
2006	3.48
2007	3.5
2008	4.11
2009	3.49
2010	2.8
2011	2.77
2012	2.69
2013	2.69
2014	2.69
2015	2.49
2016	2.49
2017	2.5
2018	2.5
2019	2.45
2020	2.45
2021	2.45