Year	% of total
1992	19.742608267716534
1993	22.05255025847214
1994	26.166923620933524
1995	18.516235584843493
1996	19.075451923076923
1997	10.411524008350732
1998	11.361341040462428
1999	6.086721088435374
2000	5.464977645305514
2001	3.708789173789174
2002	3.8815041782729804
2003	4.341879021879022
2004	4.100629820051414
2005	3.4966503667481663
2006	4.319523809523809
2007	2.072260442260442
2008	4.004453987730061
2009	4.559751308900524
2010	3.9320843373493974
2011	3.9963712574850296
2012	5.090552825552825
2013	7.711935933147632
2014	4.565914396887159
2015	4.618042394014963
2016	3.3336363636363635