Year	% of total merchandise exports
1963	0.05198856251624642
1965	0.08968609865470852
1969	0.014615609470914937
1974	0.25342118601115055
1975	2.313208420078649
1976	0.19767729182110205
1977	0.05405892422740788
1989	0.24775561720834025
1990	0.19070845479772552
1991	0.02799350121435854
1992	0.042096797930286214
1993	0.04291596063972009
1994	0.6004622155049033
1995	0.23222111295393985
1996	0.3558567607030685
1997	0.14704278679433871
1998	0.19214950377577533
1999	0.027756609926278483
2017	0.00015217191165203153
2018	0.0018873071070649719
2019	0.0044621710013149135
2020	0.0014737863183338434