Year	% of total merchandise exports
1960	0.4503485184323897
1961	0.33505613836126774
1962	0.3301133438491512
1963	0.392952869100795
1964	0.4652735568168093
1965	0.6220022091333699
1966	0.5204450825782307
1967	0.6451187715586545
1968	0.6292731892776288
1969	0.4341484798727066
1970	0.5816316027770292
1971	0.7052500489008384
1972	0.871311039334966
1973	1.7930719418193044
1974	3.5313236949896023
1975	3.8140259556310974
1976	2.2176058181731935
1977	2.363382473547968
1978	1.912356420551054
1979	1.6913990391347995
1980	2.25013721825659
1981	2.548522590855198
1982	2.762875352268437
1983	3.151442223241916
1984	2.9332875891040935
1985	2.947002422518607
1986	2.5399026129832407
1987	1.9722092290603412
1988	2.1973327994682155
1989	1.9786667841473378
1990	2.2580497465685223
1991	1.6692669819210946
1992	1.5949402753933972
1993	1.2975481685283798
1994	1.067410773045289
1995	1.3594696471388874
1996	1.3859944287616326
1997	1.4375405935816554
1998	1.2146665099532983
1999	0.9358970567169089
2000	0.7975823677271837
2001	1.050329446164672
2002	1.1222710138027057
2003	1.1353163700701863
2004	1.3364833287366622
2005	1.2396032187511201
2006	1.3285259426967868
2007	1.4219298152467565
2008	1.5396568987110848
2009	1.7524468771911508
2010	1.8668452813146008
2011	1.8787456119030481
2012	1.699704015553675
2013	1.636539427305854
2014	1.5946861350112873
2015	1.5331147129067753
2016	1.6767289068934172
2017	1.72570396651454
2018	1.7275113534830164
2019	1.4588984422311086
2020	1.436700947616914