Year	%
2000	23.853502537528005
2001	23.805164209814297
2002	23.675505697959572
2003	23.600216098751584
2004	23.288752453486644
2005	22.995341940101248
2006	22.839963643653242
2007	22.579554131931374
2008	22.423761410340138
2009	22.237915599506927
2010	21.921443252732278
2011	21.551333209081328
2012	21.59609894348927
2013	21.212887748508606
2014	21.11978912586768
2015	21.265993268448018
2016	20.87574545625558
2017	20.520184499296214
2018	20.42809665842161
2019	20.300419388466572