Year	Percent
2001	85.86436
2002	86.02958
2003	86.1932
2004	86.35523
2005	86.51533
2006	86.66102
2007	86.6801
2008	86.27042
2009	85.85379
2010	85.43103
2011	85.00233
2012	84.56643
2013	84.12303
2014	83.67295
2015	83.21614
2016	82.75312
2017	82.28384
2018	81.80905
2019	81.32845
2020	81.37833
2021	81.42211
2022	81.45967