Year	%
2000	24.703708688235505
2001	24.433385108002103
2002	24.335789544556697
2003	24.12518545774964
2004	23.653542337999347
2005	23.346985096039027
2006	22.87310933488518
2007	22.53775829725549
2008	22.36057789741881
2009	22.0907518539099
2010	21.948340572498815
2011	21.674821524920954
2012	21.37368891259969
2013	20.839103638419267
2014	20.536485584302163
2015	20.446825250249454
2016	20.341425017660782
2017	19.999159808928216
2018	19.80378396735087
2019	19.632873184562875