Year	%
2000	18.569557245219805
2001	18.214733685578846
2002	18.31379213593916
2003	18.344836340475208
2004	18.11470836048753
2005	17.470057996632303
2006	16.821071902120945
2007	16.292418344283814
2008	15.884703274787217
2009	15.473411333602629
2010	15.13628295060891
2011	14.749214461475201
2012	14.278620672524532
2013	13.86702455118999
2014	13.653838524723135
2015	13.443829326122279
2016	13.304373669870575
2017	13.12106884522833
2018	12.96221621532628
2019	12.836466955027685