Year	% of total
1992	11.054926470588235
1993	8.830154938670109
1994	5.8108226567768035
1995	4.333727272727272
1996	3.5857235984354627
1997	5.441354838709677
1998	4.804623714131023
1999	4.239535386277688
2000	8.918631578947368
2001	9.568578124999998
2002	10.921439842209073
2003	11.403165201295696
2004	12.107527238275697
2005	12.246106194690265
2006	10.97386216466235
2007	11.43834862385321
2008	12.127750689972402
2009	9.690841535433071
2010	13.266022610483045
2011	14.0594012605042
2012	13.73549828178694
2013	15.042447183098592
2014	15.036046511627907
2015	13.784226618705034
2016	14.590070838252656