Year	%
2000	21.27171135391149
2001	20.670940974534513
2002	20.280307222807174
2003	19.868957560774724
2004	19.19993127691356
2005	18.86788970497044
2006	18.366907413299433
2007	18.097799553131768
2008	17.865262601385066
2009	17.553809974542318
2010	17.042402163775158
2011	16.831376284428632
2012	16.630866023268545
2013	16.41944919321169
2014	16.230199618461626
2015	16.200194937250412
2016	16.311144877880572
2017	16.010913088154904
2018	15.788209713292112
2019	15.57552287435935