Year	Percent
2000	51.09814
2001	51.79044
2002	52.542
2003	53.35042
2004	54.21503
2005	55.13172
2006	56.10058
2007	57.11857
2008	58.1838
2009	59.29179
2010	60.44136
2011	61.62961
2012	62.85389
2013	63.67151
2014	63.92647
2015	64.1786
2016	64.42552
2017	64.66582