Year	Percent
2000	99.49231
2001	99.41786
2002	99.34341
2003	99.26897
2004	99.19452
2005	99.12007
2006	99.04562
2007	98.97117
2008	98.89672
2009	98.82228
2010	98.74783
2011	98.67338
2012	98.59893
2013	98.52448
2014	98.45004
2015	98.37559
2016	98.30114
2017	98.22669
2018	98.15224
2019	98.07779
2020	98.00335
2021	97.9289
2022	97.85445