Year	% of total
1990	23.9585147103759
1995	25.0460345388217
2000	14.5304278170528
2005	13.3279586474324
2010	12.1420085325623
2011	20.0628397756662
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0