Year	%
1997	18
1998	18
2000	26
2001	26
2002	26
2003	26
2005	16
2006	16
2007	16
2009	16.8
2010	16.8
2011	16.8
2012	16.8
2013	16.8
2014	26.4
2015	25.8064516129032
2016	25.8064516129032
2017	25.8064516129032
2018	24.8
2019	25
2020	25
2021	25
2022	25.8620689655172
2023	25.6