Year	Percent
2002	87.10082
2003	88.16051
2004	88.94891
2005	88.28546
2006	87.56297
2007	88.50502
2008	88.6154
2009	89.25196
2010	89.10955
2011	89.16146
2012	89.06469
2013	89.73969
2014	90.34428
2015	90.20615
2016	90.87295
2017	91.82695