Year	% of total
1992	9.13996996996997
1993	10.367312579415502
1994	9.136549628629306
1995	7.846419213973799
1996	6.931995783555868
1997	5.663829022988506
1998	4.561937457511897
1999	4.6099428571428565
2000	3.5937297811607998
2001	3.0585739910313903
2002	4.96777183600713
2003	6.367453250222618
2004	5.849958018471872
2005	5.973522992985191
2006	8.02684331797235
2007	7.439485238455715
2008	6.373728943338437
2009	5.583627031650984
2010	6.373595238095238
2011	7.742820945945946
2012	7.530720871751885
2013	9.062312444836715
2014	8.00256906077348
2015	6.260731707317073
2016	6.286285714285714