Year	%
2000	24.555948401866903
2001	24.180481042434867
2002	23.987126919393315
2003	23.795946665495077
2004	23.616404058682654
2005	23.46045965322186
2006	23.285675622271853
2007	22.864142351472587
2008	22.530983397363407
2009	22.259748576154994
2010	22.02466266934034
2011	21.660625519480387
2012	21.322216470202825
2013	21.097851641804
2014	20.83916739195321
2015	20.675631940438308
2016	20.577782683442507
2017	20.43141551673675
2018	20.389891217048955
2019	20.287093284961596