Year	%
1997	8.006672226855715
1998	7.990970654627543
1999	7.848309975267931
2002	11.018678386438548
2003	11.453870322764924
2004	12.022703818369457
2005	14.85407980941037
2006	14.997064004697595
2007	16.235180256472297
2008	17.14252553389044
2009	17.576579631513514
2010	17.4670538306902
2011	19.113924050632917
2012	19.979220779220782
2013	19.13496376811594
2014	19.3991690635986
2015	21.05101098224366
2016	21.20598947794415
2017	21.417291748914334
2018	21.152856407617094
2019	21.157663775989977
2020	22.20159440864913
2021	23.243598161523316
2022	23.75620454807804
2023	24.16491473954684