Year	% of total primary
1970	37.6779289245605
1971	44.0220985412598
1972	30.0833492279053
2000	6.49784994125366
2006	5.00438022613525
2007	5.56809997558594
2008	5.1366400718689
2009	6.47413015365601
2010	7.96649980545044
2011	15.6908798217773
2012	14.8512897491455
2013	14.8512897491455
2014	13.4749298095703
2016	12.6561403274536
2018	19.7373695373535
2020	17.8594398498535
2021	19.110200881958