Year	Percent
2000	65.63661
2001	65.99236
2002	66.35421
2003	66.72213
2004	67.09669
2005	67.47722
2006	67.8645
2007	68.23732
2008	68.61575
2009	68.99924
2010	69.38859
2011	69.78368
2012	70.15478
2013	70.52984
2014	70.90917
2015	71.2931
2016	71.6812
2017	72.07381
2018	72.47257
2019	72.87738
2020	73.28892
2021	73.62876
2022	73.97071