Year	%
1995	19.66
1998	19.23
2000	19.16
2001	19.04
2002	18.27
2003	19.3
2004	19.3
2005	19.17
2007	18.35
2008	18.39
2009	18.07
2010	18.13
2011	18.18
2012	18.26
2013	18.29
2015	17.81
2016	18.66
2019	18.43