Year	% of total
1990	0.01607200257152041
1991	0.015693659761456372
1992	0.016202203499675955
1993	0.016742005692281934
1994	0.015509887553315237
1995	0.1161620072794858
1996	0.06126981695642184
1997	0.07589556769884638
1998	0.793997668997669
1999	1.2969386216256975
2000	2.1506165590135056
2001	2.04617724319093
2002	1.972872996300863
2003	2.677279305354559
2004	2.3443127496562113
2005	2.242508434213138
2006	2.4545153820707903
2007	3.0113674134148773
2008	2.902616013171535
2009	3.6151923428641104
2010	3.3712703783451246
2011	3.0725730442978323
2012	3.4152302546951376
2013	3.219684989562907
2014	2.179106216861854
2015	2.726597826820544