Year	% of total
1990	3.5207918935390756
1991	4.205166141769043
1992	3.124244501955873
1993	4.8056663242029005
1994	5.977909655522833
1995	5.1351504738908575
1996	4.7224881691604885
1997	5.5424965977978475
1998	9.116342110445652
1999	8.330619271390685
2000	6.5826273289386865
2001	6.962842080287958
2002	5.546401493328417
2003	5.126298499511676
2004	6.456628028346975
2005	6.6498846234529045
2006	6.668633204473356
2007	5.227489286678795
2008	5.977589232862202
2009	6.874823608015252
2010	6.965068739805537
2011	5.614830621499067
2012	5.282739220519956
2013	7.124714773935759
2014	4.658881714521225
2015	3.3292619734991487