Year	% of total
1990	5.99387509593414
1995	5.82018822854645
2000	5.78850547497043
2005	5.77689616084763
2010	5.76508661469074
2011	5.76270141529186
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0