Year	Percent
2000	75.43884
2001	75.80583
2002	75.32159
2003	75.599
2004	75.43119
2005	75.19614
2006	75.57368
2007	75.58539
2008	76.25758
2009	77.51295
2010	78.06872
2011	78.03103
2012	78.49551
2013	79.28179
2014	79.53711
2015	80.00884
2016	79.20449