Year	% of total merchandise exports
1964	1.015228426395939
1975	0.8090775769928662
1980	1.9818869449089296
1990	0.0007271999662835016
1991	0.10378999627940208
1992	0.23304617497334176
1993	0.23503628769712082
1995	0.001977329115993421
1996	0.010394999290341924
1997	0.0003451391838475886
1998	0.7460892413739867
1999	0.4655821155243203
2000	0.24400713737246674
2001	0.33727495897082904
2002	0.7080793093059045
2003	0.7346609933452719
2004	1.2744512783115893
2005	1.2534093340248516
2006	1.3259996220161618
2007	4.091695216223468
2008	2.8230715914004216
2009	4.516556951163548
2010	3.9740027964128246
2011	4.11914340973145
2012	4.339237423864279
2013	4.50360780761732
2014	4.0614263726205895
2015	3.0158998118889135
2016	3.430011363068493
2017	3.3565570605711463
2018	3.439012769096043
2019	3.640689347875422
2020	3.363821185991342