Year	% of total primary
1970	90.2726821899414
1971	88.2397384643555
1973	98.6793518066406
1974	78.0358810424805
1980	12.8749599456787
1981	12.9217500686646
1982	12.7809000015259
1983	13.3436298370361
1984	9.15995979309082
1986	7.37557983398438
1990	11.6769599914551
1991	10.9020395278931
1992	9.63053035736084
1993	10.5581197738647
2006	17.3951301574707
2007	18.3042602539062
2014	25.9097309112549
2015	25.4307498931885
2016	25.7716693878174
2017	25.4732608795166
2018	24.7106990814209
2019	24.8893699645996