Year	% of total merchandise exports
1974	12.634734757457867
1975	13.014199727312029
1976	11.29575774361815
1977	14.165985950008169
1979	11.579070953742015
1980	11.49399260886824
1981	14.069516743291196
1982	11.433695684132028
1983	13.86197796607475
1984	20.244455995015322
1985	20.244455993178878
1986	20.244455994929307
1987	20.244455992699788
1988	2.8075405400598945
1989	2.807540540563221
1990	2.837071061875169
1991	24.991356740120217
1992	30.05855141177808
1993	33.063415995026595
1994	8.32813565822012
1995	9.335818631233513
1996	7.222838521046116
1997	16.466670092013885
1998	12.98384970105794
1999	12.311280506822818
2000	22.708313188539528
2001	24.47522649763505
2002	20.276919974406425
2003	21.836886836999845
2004	19.25114143836029
2005	20.59207302759358
2006	22.5355215138461
2007	20.86967537185212
2008	20.895070492099972
2009	22.473039047677574
2010	26.139621597124098
2011	26.300418263046893
2012	26.685749474270608
2013	18.639303850585275
2014	26.975053096166015
2015	10.85498481695733
2016	17.06659732248153
2017	23.570523599943886
2018	29.154567469618403
2019	28.423420219445887
2020	27.081785570636658