Year	%
2000	18.39593639345421
2001	18.05456641889726
2002	18.20239905050252
2003	18.23097632582086
2004	17.955109851694754
2005	17.266545936597538
2006	16.47432867609618
2007	15.84738309484065
2008	15.407047176923333
2009	14.940512676499832
2010	14.596564372568807
2011	14.166493520868396
2012	13.624640563437964
2013	13.169960039225161
2014	12.996217464559185
2015	12.692107555788924
2016	12.561797438758035
2017	12.355506472932229
2018	12.22103485583791
2019	12.059900969753963