Year	% of total primary
1999	1.30147004127502
2001	1.34082996845245
2003	1.67176997661591
2004	1.79982995986938
2005	2.32894992828369
2008	3.29537010192871
2010	3.95402002334595
2011	4.77708005905151
2012	4.81205987930298
2013	5.52429008483887
2016	5.0354700088501