Year	%
2000	22.14349367143263
2001	21.558813404044734
2002	21.479081837358056
2003	21.274704974811435
2004	20.880049277513166
2005	20.938856317578747
2006	20.192925291404066
2007	19.74070420273076
2008	19.33729228410822
2009	18.679996190856752
2010	18.288518925549354
2011	17.646564545606196
2012	17.04778693182227
2013	16.570622657613807
2014	16.553027832161014
2015	16.046092135332213
2016	15.831352517426799
2017	15.520233534366076
2018	15.41835521648378
2019	15.154434990213513