Year	% of total merchandise exports
1972	7.856372167716358
1973	22.383576167451125
1976	9.427728293142154
1978	5.733390854184642
1979	8.728387478703624
1980	2.3962085450837898
1981	6.695564557281471
1982	6.695564569384594
1983	6.695564565439235
1984	6.695564547432066
1985	6.695564571790672
1986	2.7699845641676784
1987	3.498724892440493
1988	3.2321627062739307
1989	3.2770464013180596
1990	2.6640923121285214
1991	2.4197813477653454
1992	2.393470034112622
1993	2.842628929769913
1994	3.2135011361842007
1995	3.008477458458483
1996	2.835933196172568
1997	2.4403874430355392
1998	2.8414862465607262
1999	2.2052520548130636
2000	9.767044250809745
2001	0.08080637518153236
2002	4.734665631096869
2003	6.558297742662672
2004	7.87233032076399
2005	11.040825720033771
2006	9.997272829031346
2007	7.608182702075365
2008	9.110175162998596
2009	1.1493407133978844
2010	0.0012862332565624131
2011	0.00042859905833756324
2012	0.030744695901375442
2013	0.019193310741456346
2014	0.0011694502953613227
2015	0.0002860854709580691
2016	1.3933761624668928
2017	1.0802340045297996
2018	1.020478950331859
2019	0.7988495387237153
2020	0.46392667698993745