Year	Percent
2000	20.59397
2001	20.54728
2002	20.50059
2003	20.45361
2004	20.40632
2005	19.97215
2006	19.54504
2007	19.12489
2008	18.71103
2009	18.30309
2010	17.90095
2011	17.50401
2012	17.11216
2013	16.72504
2014	16.34208
2015	15.96319
2016	15.58824
2017	15.21649
2018	14.84784
2019	14.48198
2020	14.11863
2021	13.75751
2022	13.84629