Year	Percent
2000	78.85769
2001	78.85769
2002	78.94798
2003	79.03785
2004	79.1273
2005	79.21634
2006	79.30497
2007	79.39318
2008	79.48097
2009	79.56835
2010	79.65532
2011	79.74186
2012	79.828
2013	79.91372
2014	79.99902
2015	80.08391
2016	80.16838
2017	80.25244
2018	80.33608
2019	80.41931
2020	80.50212
2021	80.67914
2022	80.85615