Year	%
2000	23.404470979898814
2001	23.11665186656078
2002	23.12304953307935
2003	23.104529415581545
2004	22.97710850101479
2005	22.436307686350144
2006	21.630684080100856
2007	21.08188406743332
2008	20.76705770189978
2009	20.534715145004665
2010	20.28152740962663
2011	20.01779216523252
2012	19.716260982873198
2013	19.23568735715233
2014	18.838100540587504
2015	18.561810456269058
2016	18.407586038403355
2017	18.147824705697833
2018	17.9091118042067
2019	17.806396221553328