Year	%
1995	31.57
1996	31.6
1997	31.6
1998	31.6
2000	31.6
2001	31.6
2002	31.35
2003	31.35
2004	31.35
2005	31.33
2006	31.35
2007	30.12
2008	30.12
2009	30.12
2010	30.12
2011	30.12
2012	30.66
2013	30.66
2014	30.66
2015	30.66
2016	30.66
2017	30.69
2018	30.69
2019	30.69
2020	30.67
2021	30.69