Year	% of total
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0.23375056552556178
2000	0.5137991779213152
2001	0.4977187888842804
2002	0.6987258528565558
2003	0.8827785817655571
2004	0.7923515159452558
2005	0.7541178805318516
2006	0.740985775719484
2007	0.7511799508076846
2008	1.7684005122263553
2009	1.1705175882460526
2010	1.4211011996308829
2011	1.9981149858623939
2012	2.7656290198096216
2013	3.0425706875830225
2014	3.023946862436637
2015	3.691705473442667