Year	% of total primary
2005	7.14422988891602
2007	8.21298027038574
2008	8.11073017120361
2009	8.84716987609863
2010	9.18323040008545
2011	9.697190284729
2012	10.0815496444702
2013	12.0772304534912
2014	13.5876598358154
2015	15.7829599380493
2016	16.7299709320068
2017	16.4085998535156
2018	15.7989301681519
2019	15.5823202133179
2020	15.7261600494385
2021	14.0717296600342
2022	12.7088003158569