Year	%
1997	40.71
1998	40.5
2000	40.5
2001	40.5
2003	38.15
2004	38.15
2005	38.15
2006	38.15
2007	38.46
2008	38.46
2009	38.46
2010	38.46
2011	38.44
2012	40.67
2014	40.67
2015	40.52
2017	40.52
2018	40.57
2019	40.56
2020	40.56
2021	40.56