Year	%
2000	22.31015738046238
2001	22.449978761498624
2002	22.446838084885346
2003	22.30970350616243
2004	22.103859276109098
2005	21.966222476976093
2006	21.84350220161847
2007	21.63426019886106
2008	21.60180307592957
2009	21.526781516048565
2010	21.327909029842836
2011	20.921069264330004
2012	21.012986836510603
2013	20.49085118317593
2014	20.439581975881193
2015	20.61877879783777
2016	20.24895380253736
2017	19.837638791756937
2018	19.8554138611929
2019	19.73487420931827