Year	%
2000	26.5838828008365
2001	26.229568531353568
2002	26.02416854927964
2003	25.867967011543392
2004	25.902100366906698
2005	25.40204650828096
2006	24.59716542557277
2007	24.190325370413436
2008	24.04867671492736
2009	23.899413541858856
2010	23.79930227058913
2011	23.643594041873296
2012	23.42438356721301
2013	23.04479878555269
2014	22.55552270346043
2015	22.324872173357633
2016	22.130389853852048
2017	21.68416008354211
2018	21.38921421026348
2019	21.232235163879125