Year	% of total
1990	1.6665981186120093
1991	1.2301459551851612
1992	0.9625887123033252
1993	0.9381247810247634
1994	0.8301203264926202
1995	0.6010259598545259
1996	0.5609397952822401
1997	0.46871417639054863
1998	0.5103207121600261
1999	0.4686359026390134
2000	0.41569947520937156
2001	0.40402027493670584
2002	0.6338833245606039
2003	0.6015276761993974
2004	0.610943568503848
2005	0.5909805285894285
2006	0.6102084984393764
2007	0.9449103985219169
2008	0.9545855824510909
2009	1.1154416833261989
2010	1.2698912210282223
2011	1.9091085976971152
2012	1.7442397240390792
2013	1.755234793087202
2014	2.1699595354417838
2015	2.1591777619842563
2016	2.3228787906048893