Year	% of total merchandise exports
1981	28.067739873134105
1982	27.551970819776784
1983	22.34054572511754
1984	28.96636616317797
1985	35.4773534626273
1986	29.29668268540768
1987	31.65683251332192
1988	25.473073215917253
1989	24.755823042472205
1990	21.143903146038355
1991	11.981192649486982
1992	15.016973275393333
1993	6.074037363607912
1994	5.707776200232476
1995	5.4559642398136505
1996	4.270676145451094
1997	0.45936297828087097
1998	0.3507587270517881
1999	1.2317674603174988
2000	2.1892073297784753
2001	3.1121019393018647
2002	2.2808252424920914
2003	2.3573725838081394
2004	5.023844228910977
2005	1.9383712379359226
2006	0.008012617259024473
2007	0.0025336273177955925
2008	0.0008692587274889153
2009	0.46297180204840094
2010	0.3127996723415591
2011	0.21638170644015783
2012	0.5241457946468144
2013	0.5009904264494995
2014	0.4999030041434615
2015	0.5020613706633761
2016	0.26144120613121496
2017	0.10033580228642869
2018	0.008354250702749734
2019	0.001019695805042915
2020	0.0003673777697142589