Year	% of merchandise exports
1978	26.40039387615834
2007	11.110138418399826
2009	11.191241498317238
2010	11.681213374771161
2011	11.985366682893254
2012	12.650706696326605
2013	12.562822179150197
2014	17.09322357248569
2015	15.345225277104824
2016	19.24261150462037
2017	18.697480937859403
2018	18.94912711020251
2019	16.587009555965498