Year	Percent
2000	57.15587
2001	57.46333
2002	57.95336
2003	58.44133
2004	59.50972
2005	60.57694
2006	61.64257
2007	62.70681
2008	63.77039
2009	64.83276
2010	65.89391
2011	66.95218
2012	68.00757
2013	69.05954
2014	70.10704
2015	71.14958
2016	72.18666
2017	73.21776
2018	73.40682
2019	73.59587
2020	73.78451
2021	73.97233