Year	%
1997	32.45
1998	32.15
2000	32.15
2001	32.15
2003	29.1
2004	29.1
2005	29.1
2006	29.1
2007	29.24
2008	29.24
2009	29.24
2010	29.24
2011	29.22
2012	29.32
2014	29.32
2015	29.11
2017	29.11
2018	29.13
2019	29.13
2020	29.13
2021	29.13