Year	% of total
1992	25.15923766816143
1993	14.061771286513364
1994	10.712978927203064
1995	4.976002444987775
1996	37.880801886792455
1997	47.29898550724638
1998	60.84721442885771
1999	56.140796460176986
2000	44.511383647798745
2001	47.60849431818181
2002	54.13780405405405
2003	54.30873417721519
2004	46.027922848664694
2005	44.02129716981132
2006	44.62817021276596
2007	44.81165186500888
2008	45.61020661157025
2009	49.98081850533808
2010	51.972142857142856
2011	41.56308282208589
2012	37.843031988873435
2013	33.91039540816326
2014	33.46624557260921
2015	34.99593478260869
2016	40.242