Year	%
1995	18.24
1998	18.12
2000	17.93
2001	18.04
2002	18.04
2003	18.22
2004	18.22
2005	18.05
2007	17.86
2008	17.76
2009	17.76
2010	17.75
2011	17.75
2012	17.68
2013	17.68
2015	17.68
2016	17.68
2019	18.07