Year	%
2000	24.769336684026694
2001	24.61360922774632
2002	24.50210462825691
2003	24.15124247653486
2004	23.42418535003987
2005	23.396154888561647
2006	23.473605113427304
2007	23.482427587637172
2008	23.4660853081569
2009	23.32271321800007
2010	23.386325237083085
2011	23.238130271674382
2012	23.066649124087697
2013	22.47156556707143
2014	22.116785497693407
2015	22.369536935992624
2016	22.257016612782902
2017	21.93334824432275
2018	21.73251525801869
2019	21.564627247426884