Year	%
2000	24.407642663294556
2001	24.092498106067588
2002	23.928757013410745
2003	23.806019747860038
2004	23.639208482963063
2005	23.409940567242128
2006	23.279107977819198
2007	23.00690559094858
2008	22.831096171288983
2009	22.63489241092233
2010	22.334705307014328
2011	22.033012173313367
2012	21.681496479116177
2013	21.47855148407112
2014	21.279094884505913
2015	21.093588283195654
2016	20.916972862332905
2017	20.612011992291837
2018	20.319279828235626
2019	20.137518937254875