Year	% of total
1990	10.178510407335676
1991	10.395350407907427
1992	10.877036988431167
1993	11.619439624321073
1994	10.877756341657836
1995	11.31794804580039
1996	12.768427732311565
1997	13.071327637178362
1998	12.657047513492383
1999	13.294631031531779
2000	13.890903824590014
2001	14.063841685526778
2002	14.433493148416614
2003	14.364962354626707
2004	14.014282174184556
2005	14.141056405601038
2006	14.013137603735396
2007	13.955528151606428
2008	13.938693599795052
2009	14.243817452482336
2010	14.100205357247434
2011	13.990760701599998
2012	13.97175405486078
2013	13.291927850696775
2014	13.956307056109992
2015	0