Year	% of total
1990	7.65149372963797
1995	7.66992554976347
2000	6.97638645052365
2005	9.40935490167636
2010	10.72805723562
2011	9.959149585251
2012	10.5206070214642
2013	7.58933020939015
2014	7.64026840299643
2015	0
2016	0
2017	0