Year	%
2000	23.93870319458033
2001	23.929125994660676
2002	23.790581187922612
2003	23.712391252177873
2004	23.40456370694219
2005	23.046265308353853
2006	22.86613147988889
2007	22.56915299943125
2008	22.41409016953569
2009	22.26573503000085
2010	21.951154262100857
2011	21.6267355776118
2012	21.771903683351784
2013	21.417899186014072
2014	21.417238548238593
2015	21.669282536340326
2016	21.302073392193808
2017	20.945041468388105
2018	20.919369369375058
2019	20.822228044557452