Year	Percent
2000	98.05648
2001	98.03166
2002	98.00082
2003	97.97132
2004	97.94314
2005	97.91633
2006	97.89216
2007	97.87048
2008	97.84975
2009	97.82848
2010	97.80817
2011	97.79029
2012	97.77327
2013	97.75889
2014	97.74682
2015	97.73522
2016	97.72413
2017	97.71353
2018	97.70364
2019	97.69441
2020	97.68579
2021	97.67775
2022	97.67023