Year	% of total merchandise exports
1960	6.185983283146602
1961	6.153687025726491
1962	5.652576220634302
1963	4.974150076001003
1964	5.006933047186161
1965	4.51979928601903
1966	4.7451165213383835
1967	4.519532223042395
1968	4.580426275077722
1969	4.356308005542049
1970	4.328125125723952
1971	4.205919296577524
1972	4.022152718426911
1973	3.9540968783574284
1974	4.7365243425680035
1975	4.643955577153731
1976	3.899690721758052
1977	3.6786093396672466
1978	3.647751744550387
1979	3.8437873911879894
1980	4.257097771217645
1981	4.409193157641559
1982	3.603771723471739
1983	2.967349131996561
1984	2.9942394464887734
1985	3.010009612689503
1986	2.88131205306194
1987	2.7500078277799265
1988	2.7484657706974778
1989	2.922794315345608
1990	2.8853210893368506
1991	3.216753051909458
1992	3.6072173192990076
1993	3.9170131122815603
1994	4.19487803224011
1995	3.7560036416339404
1996	4.00126993688819
1997	4.445359457156636
1998	4.7850448996963095
1999	4.45956960389575
2000	4.6342017232131205
2001	4.634230191504364
2002	4.172727064240915
2003	3.6908065134861308
2004	3.6095720228659327
2005	3.6845778262973807
2006	3.812917548897439
2007	3.7683914589462235
2008	3.950932214649498
2009	4.071223352838501
2010	4.462097371046468
2011	4.556907736796441
2012	4.750925251372263
2013	4.843827913088003
2014	4.928096799029548
2015	5.135020733690358
2016	4.991213225200827
2017	4.928323058464002
2018	4.8461803745866145
2019	4.868245443699871
2020	4.433100377828912