Year	% of total primary
2004	35.9612083435059
2005	35.7982215881348
2006	33.7087593078613
2007	31.1582698822021
2009	30.912540435791
2010	30.7494106292725
2011	32.28125
2012	33.6752700805664
2013	34.6871109008789
2014	37.3010406494141
2015	38.1863098144531
2016	36.6323699951172
2017	35.0267715454102
2018	34.8029403686523
2019	34.2968482971191