Year	% of total
2000	100
2001	100
2002	100
2003	100
2004	100
2005	99.12663755458514
2006	99.08256880733946
2007	99.10714285714286
2008	98.68421052631578
2009	98.83268482490273
2010	98.97610921501706
2011	100
2012	100
2013	99.09706546275395
2014	99.09706546275395
2015	99.2467043314501