Year	% of total
1990	69.7458371442677
1995	69.1043023181923
2000	74.7669337045094
2005	86.8443371767628
2010	78.9696638694942
2011	78.4715483079355
2012	53.8229700265059
2013	63.5341087740451
2014	47.5028475342356
2015	57.8820734844947
2016	13.0399320025323
2017	19.3104024006679