Year	% of merchandise exports
1970	4.272030025796216
1971	6.566330673109294
1972	6.677928755623877
1975	8.998378102759064
1976	7.684995083476956
2003	1.1042959341218956
2004	0.10567968979143139
2005	0.2141074199842942
2015	12.16279763069684
2018	31.45282828599972