Year	%
2000	24.407642663294556
2001	24.092498106067588
2002	23.92875701341074
2003	23.80601974786004
2004	23.639208482963063
2005	23.409940567242124
2006	23.2791079778192
2007	23.006905590948577
2008	22.831096171288983
2009	22.63489241092233
2010	22.334705307014325
2011	22.03301217331337
2012	21.681496479116174
2013	21.478551484071122
2014	21.279094884505913
2015	21.093588283195658
2016	20.91697286233291
2017	20.61201199229184
2018	20.31927982823563
2019	20.137518937254878