Year	% of total
1990	33.6213311226157
1995	33.7586340017717
2000	11.6607607435924
2005	13.35929632477
2010	15.1565554804827
2011	15.4983338203787
2012	15.8457474277768
2013	16.2108450773339
2014	16.5989802462163
2015	17.0064417974656
2016	0
2017	0