Year	% of total
2000	83.92267428874783
2001	86.39372468677597
2002	86.27717104290332
2003	86.95110426235033
2004	86.76230642799958
2005	87.20963160429261
2006	87.30212011079136
2007	88.08794968770006
2008	87.57461411473567
2009	88.18078595659829
2010	88.37101081685341
2011	88.6430812659121
2012	88.63153031715788
2013	90.2107913104522
2014	86.12158200474131