Year	% of total primary
1975	52.4073600769043
1984	33.4271507263184
1998	39.5596694946289
1999	38.4430694580078
2006	36.351390838623
2008	29.8455009460449
2009	33.2830505371094
2011	32.5509185791016
2014	35.0000114440918
2015	33.2834091186523
2016	48.4960708618164
2017	48.327091217041
2020	49.6295013427734