Year	% of total
2000	0.6425431180250254
2001	0.6417112299465241
2002	0.6460296096904442
2003	0.7162534435261708
2004	0.6369426751592357
2005	0.6056527590847914
2006	0.6540369869192603
2007	0.6411582213029989
2008	0.6392870980240217
2009	0.30144694533762056
2010	0.42569659442724456
2011	0.3620065505947251
2012	0.23557126030624262
2013	0.22988505747126436
2014	0.27593818984547464
2015	0.24513809445987905