Year	%
2000	24.173827708957702
2001	24.158374267865213
2002	23.935746832577504
2003	23.711641816610914
2004	23.449961058786137
2005	22.93574677690539
2006	22.39499985370233
2007	21.94426529477543
2008	21.226955272102582
2009	20.84245689444594
2010	20.268081119663503
2011	19.78930902190875
2012	19.520209748644234
2013	19.15346770586749
2014	18.93183714426036
2015	18.608093418859884
2016	18.434240294822775
2017	18.250189721751035
2018	18.13136800650779
2019	17.898789487079302