Year	% of merchandise exports
1975	4.647227006771323
1976	5.8859556609102555
1977	6.304894329114087
1978	4.504775361694134
1979	4.398954931949993
1980	4.642226744449936
1999	29.312309896398308
2000	37.273938997945464
2001	29.18029830089791
2002	32.709320892926975
2003	39.06466725611167
2004	47.653839088115205
2005	48.79937772188916
2006	2.062303003739132
2016	23.215053113319602
2017	1.99053387712111
2018	7.222862319255144