Year	% of total primary
1971	18.9284191131592
1972	15.0944995880127
1974	34.7717514038086
1975	32.3429908752441
1976	30.8730201721191
1984	31.0514297485352
2000	38.1957817077637
2007	49.701789855957
2008	51.6952095031738
2009	52.7935409545898
2010	51.9370918273926
2011	52.1971397399902
2012	52.597339630127
2014	51.3763313293457
2015	51.5728912353516
2017	49.8793487548828
2018	48.7602500915527