Year	% of total
2000	97.59891782211702
2001	97.96791443850267
2002	97.9542395693136
2003	97.85123966942149
2004	96.59480646741794
2005	96.88200986989682
2006	97.0681100586378
2007	97.41468459152016
2008	97.88841534289035
2009	97.28697749196141
2010	96.53637770897832
2011	97.82796069643165
2012	98.14908295473667
2013	97.57854406130268
2014	96.94628403237675
2015	97.46690635724792