Year	% of total
1990	55.3943883512523
1995	57.0007146654744
2000	43.485858312646
2005	37.1434287353243
2010	25.3203394310416
2011	40.0145631663992
2012	15.5356142687961
2013	0
2014	0
2015	0
2016	0
2017	0