Year	%
1994	18.33
1995	18.23
2001	18.04
2002	18.04
2003	18.22
2004	18.22
2005	18.05
2006	18.22
2007	17.86
2008	17.75
2009	17.62
2010	17.75
2011	17.82
2012	17.82
2013	17.93
2014	18.23
2019	18.25