Year	% of total merchandise exports
1970	40
1971	53.84615384615385
1972	66.66666666666666
1973	70
1974	65.38461538461539
1975	40
1976	35.294117647058826
1977	12.5
1978	7.751937984496124
1979	7.738095238095238
1980	10.062893081761008
1981	6.547619047619048
1982	5.714285714285714
1983	11.458333333333332
1984	13.095238095238097
1985	10.622710622710622
1986	15.819209039548024
1987	21.35922330097087
1988	45.06943386034626
1989	53.873212615205624
1990	97.25274727278801
1991	97.70642201777711
1992	91.89327148136653
1993	91.72920962202508
1994	91.79028151483132
1995	94.75965529007459
1996	63.47103455901525
1997	97.87916161574954
1998	98.253734489852
1999	98.47645428512017
2000	95.49132226211373
2001	93.53048991377987
2002	98.07901833263686
2003	98.05955884087034
2004	97.49679484125436
2005	96.31063370590473
2006	96.98511251603261
2007	97.9578584497588
2008	97.38146270173092
2009	97.21644520413743
2010	96.64325381044821
2011	98.52372608821634
2012	97.21595193552561
2013	95.6063042254699
2014	96.4999012171541
2015	92.5596287492063
2016	88.59669221567071
2017	93.24577514815621
2018	85.38338043585861
2019	91.95148641074992
2020	92.8377621464801