Year	%
2000	24.408830437541305
2001	24.093632423536675
2002	23.92984935788251
2003	23.807049942933908
2004	23.64022893698507
2005	23.41098227470785
2006	23.28016886920554
2007	23.0079260421714
2008	22.83215848159021
2009	22.636037124917674
2010	22.335860369007698
2011	22.03406726186561
2012	21.68248038781527
2013	21.47949456530777
2014	21.27998358166619
2015	21.094445976171063
2016	20.917778152027214
2017	20.612775738438376
2018	20.320002931167465
2019	20.138217010685736