Year	% of total merchandise exports
1973	12.108176403345166
1974	9.926399380205307
1975	18.930112564930184
1976	16.50278868002479
1977	13.283145904974338
1978	11.594580510682647
1979	11.990414174876246
1980	16.14836610664863
1981	20.314942072490012
1982	25.922071702874195
1983	20.105962332211856
1984	19.045713632429077
1985	18.7269648580581
1986	19.44173253092851
1987	20.254633508265062
1988	22.000955251373327
1989	23.081589424050147
1990	22.419409104424755
1991	49.41643197236113
1992	31.428229550045543
1993	22.684932809606067
1994	26.698416516340227
1995	2.869258608957803
1996	28.914307014236428
1997	29.517768975544683
1998	29.817969224115647
1999	32.02775421066025
2000	5.2413135928546755
2001	6.268957919378172
2002	6.269988588766788
2003	6.268517763259542
2004	6.269257269736932
2005	6.281148184842501
2006	6.268941670205164
2007	6.267706063607584
2008	6.2582848131483875
2009	6.267706069461934
2010	6.26963219714544
2011	6.2701392411370165
2012	6.281206292652127
2013	6.281206300370376
2014	6.28120630687664
2015	5.747217668177856
2016	5.461679115805087
2017	5.43656366051675
2018	5.531292256317073
2019	5.4678231622092595
2020	5.406495041956831