Year	% of total
1990	98.9095360164241
1995	96.8574803978865
2000	100
2005	98.9783095740322
2010	99.8908780725016
2011	100
2012	100
2013	97.1393921126607
2014	99.89114417748
2015	100
2016	100
2017	100