Year	% of total
2000	98.24146094014203
2001	98.6096256684492
2002	98.60026917900404
2003	98.56749311294766
2004	97.23174914257717
2005	97.48766262898161
2006	97.72214704555707
2007	98.05584281282317
2008	98.52770244091438
2009	97.58842443729904
2010	96.96207430340557
2011	98.18996724702637
2012	98.38465421504291
2013	97.80842911877394
2014	97.22222222222221
2015	97.7120444517078