Year	%
2000	22.9125625087723
2001	22.87585069126448
2002	22.779655043509344
2003	22.66363538110487
2004	22.53301345915711
2005	22.32597692540614
2006	22.244759762507552
2007	22.110785344589925
2008	21.822479008484464
2009	21.75694326858775
2010	21.564136644962662
2011	21.393774518107104
2012	21.275361370158663
2013	21.180103200518793
2014	20.97202099628043
2015	20.7332227664846
2016	20.568138281155655
2017	20.266065388254198
2018	20.09099325174697
2019	19.94026465955739