Year	% of total
1992	27.6619347826087
1993	34.022215628091004
1994	52.28974045801527
1995	27.10391304347826
1996	32.157746967071056
1997	34.15659050966608
1998	32.16986733001658
1999	40.03843423799582
2000	39.967944325481795
2001	30.94319899244332
2002	39.99022132796781
2003	43.09872987477639
2004	42.5398381294964
2005	43.796433962264146
2006	41.83964285714286
2007	35.64981452859351
2008	42.52938748335552
2009	40.738417159763316
2010	42.27155905511811
2011	37.63246719160105
2012	39.95061630218688
2013	38.155565031982945
2014	46.413419155509786
2015	42.27583252190848
2016	35.9139175257732