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	94.62875197472354
2010	94.5
2011	92.9245283018868
2012	62.34309623430963
2013	42.069741282339706
2014	38.86348791639451
2015	53.58198771889925