Year	% of total merchandise exports
1963	8.864049909020014
1964	3.3265246571345197
1965	3.3183856502242155
1966	2.9279760632613807
1967	1.4256150839273396
1968	0.6337888690829867
1969	21.864951768488748
1970	23.497416372042427
1972	35.77819956616052
1973	42.07633892885691
1974	39.2223589892115
1975	2.63705759888966
1976	1.1366444279713368
1977	2.441661410937922
1978	0.647887323943662
1979	0.38551120391936394
1980	0.5813185361342318
1981	1.7513134851138354
1982	2.322007853850094
1983	2.322007854847992
1984	2.322007855234924
1985	2.3220078536068565
1986	2.322007853651718
1987	2.3220078534370994
1988	2.3220078533527793
1989	1.7155128822220584
1990	7.081792231634938
1991	1.2921056345383233
1992	1.1850616217700225
1993	8.81080238948903
1994	8.5438304130309
1995	7.548444312036935
1996	9.138033461580592
1997	8.537137350450813
1998	1.2459683390371847
1999	1.0706014463001765
2000	29.11286421778466
2001	29.02163380120866
2002	29.100701128336866
2003	29.15216370174349
2004	29.15217567232907
2005	29.15361289630071
2006	29.15436352736373
2007	29.154457702877608
2008	29.15452455831578
2009	29.154353592411436
2010	29.15447976666939
2011	29.154592762896176
2012	29.154432504696288
2013	29.15460702091422
2014	29.154625361563408
2015	29.154450558204925
2016	29.153390643365924
2017	28.388798727031233
2018	31.269125536588945
2019	41.0947605903391
2020	27.283095259816765