Year	%
2000	16.403720246367648
2001	16.1301736194919
2002	16.069548951259108
2003	15.884136359588577
2004	15.426299160329197
2005	15.329043444117106
2006	14.681748692631698
2007	14.263330542978872
2008	14.053933413340719
2009	13.680536219898178
2010	13.424660991418055
2011	12.994878557426054
2012	12.681483159895938
2013	12.371481574648815
2014	12.462346041000302
2015	12.152438235532328
2016	12.109823393223067
2017	11.804480750111553
2018	11.717905650654409
2019	11.439886661116036