Year	% of total
1995	100
1996	100
1997	100
1998	100
1999	100
2000	99.77678571428571
2001	99.80353634577604
2002	95.87912087912088
2003	93.57798165137615
2004	94.84662576687116
2005	93.87966804979253
2006	94.23240033927057
2007	95.44235924932975
2008	95.6140350877193
2009	92.41706161137441
2010	91.4
2011	89.71698113207547
2012	59.7629009762901
2013	32.564679415073115
2014	10.679294578706727
2015	5.185353650216056