Year	%
1994	18.01
1995	17.64
2001	18.22
2002	18.02
2003	18.67
2004	18.67
2005	18.66
2006	18.67
2007	18.35
2008	18.28
2009	18.51
2010	18.28
2011	18.53
2012	18.44
2013	18.3
2014	18.34
2019	18.14