Year	%
2000	21.861438392613277
2001	21.69918266434868
2002	21.561348853866352
2003	20.928000000832835
2004	19.966433778230034
2005	20.018023563051997
2006	20.123306595050863
2007	20.197513180594605
2008	19.979002236604355
2009	19.633121228364963
2010	19.93886563406247
2011	20.143513823189938
2012	20.25370198183883
2013	19.93317268199391
2014	19.646099572948152
2015	20.240631933148023
2016	20.153467793901775
2017	19.833152881664333
2018	19.662628117551943
2019	19.56337292440792