Year	% of total
1990	9.992103365797274
1991	8.780703386676592
1992	8.826979117543923
1993	8.696606580238624
1994	7.181047336476046
1995	7.290619702674728
1996	7.2444866018496565
1997	7.292307692307692
1998	7.298809644928274
1999	6.372899911575224
2000	5.149637596446107
2001	4.19121656084563
2002	5.232936820815193
2003	4.028747690476936
2004	1.7432220479498095
2005	3.625805120344304
2006	3.5265221820617665
2007	3.394344499856393
2008	3.311464389308701
2009	1.11421674501334
2010	0.7501875468867216
2011	0.627122167555956
2012	0.7918807976986973
2013	0.5830083619502163
2014	0.974606921231964
2015	1.1637299470263365