Year	% of total exports
2004	29.212902363229105
2005	32.129994450385425
2007	41.070809508200576
2008	35.00164821472074
2009	42.098312762661
2010	38.40818999896752
2011	48.24577337092984
2012	49.78036438426089
2013	51.209519936979554
2014	51.27548212900499
2015	66.04335517222337
2016	51.081565541691546
2017	47.54671421722241
2018	45.874704577238845
2019	50.76375862541074
2020	47.805373690121606