Year	% of total primary
1976	28.9112796783447
1977	26.6953392028809
1980	27.2567100524902
1990	22.4224605560303
1992	22.3245906829834
1998	3.47726988792419
2000	3.34978008270264
2001	3.79091000556946
2005	26.0109004974365
2006	26.7269306182861
2007	26.3638000488281
2008	27.2155799865723
2009	27.9835891723633
2015	2.99798011779785
2019	2.41335010528564
2020	5.00797986984253