Year	%
2000	39.96886823429202
2001	39.5444183282271
2002	39.2279696110547
2003	38.901736560333006
2004	38.52615593135557
2005	38.046885328652394
2006	37.54305215420585
2007	36.99555326431456
2008	36.43687569351108
2009	35.82630689250367
2010	35.27979160118671
2011	34.82251309507871
2012	34.40852971964502
2013	34.126959530120935
2014	33.87217785778669
2015	33.69083168051837
2016	33.630616168093894
2017	33.597549998511994
2018	33.52561821510982
2019	33.536651052659344