Year	% of total merchandise exports
1977	3.2316158079039523
1978	8.182538231889357
1979	9.856679286100595
1980	7.085102810456681
1981	8.718691274756187
1982	14.850125231856568
1983	11.583625394001954
1984	9.622387296663037
1985	8.629703431248158
1986	8.934912276509309
1987	13.51091119511966
1988	9.64557775222548
1989	13.061428966321028
1990	12.429056795819358
1991	16.43803830759976
1992	19.051686707832875
1993	22.64412427232127
1994	25.102868921776096
1995	29.500335091336044
1996	21.192096935581688
1997	27.169053342981748
1998	21.400889769428737
1999	19.857480132770203
2000	17.03320013837396
2001	14.878081336285568
2002	18.88080805699772
2003	17.82506032620888
2004	9.71737817080878
2005	24.853278636454206
2006	22.606384640343084
2007	29.341778862652944
2008	35.51677931092125
2009	24.573146492120753
2010	23.861276363682233
2011	37.941536224137515
2012	33.12805485730098
2013	30.40920452969199
2014	24.442726912111915
2015	32.193126131527784
2016	27.95758262989451
2017	19.362217977195865
2018	12.584152895811032
2019	10.444918133157383
2020	8.009740553532527