Year	%
2000	23.442324902032794
2001	23.072190504612102
2002	23.04776502680135
2003	22.783690686279506
2004	22.172328940152138
2005	22.027146639030143
2006	21.11124443305337
2007	20.563895988939
2008	20.227133325769053
2009	19.71018348291862
2010	19.287883302090318
2011	18.664050188252624
2012	18.21037715459271
2013	17.794481984317272
2014	17.916469148468508
2015	17.491055573623182
2016	17.40175011445699
2017	16.926497094653424
2018	16.81085189925988
2019	16.418067252264613