Year	% of total merchandise exports
1960	3.5686974254397144
1961	2.552140504939627
1966	3.0746941403734707
1967	3.3738938053097343
1968	4.7074404045268485
1969	4.764977949876304
1970	5.787106446776612
1971	5.601764409145833
1972	6.775399942224062
1973	1.641760968935931
1974	4.338239217904523
1975	4.749481855362105
1976	1.9464017449722333
1977	0.7867517700619975
1978	1.4598516849414096
1979	2.0264358271664267
1980	1.8322477394574699
1981	5.865067791013996
1982	3.3653192609194242
1983	2.6793822400941605
1984	2.5434155957272204
1985	2.9686188971301646
1986	2.109007025042081
1987	2.5444139295506
1988	3.9900389750975602
1989	4.512163235746955
1990	4.36063279339745
1991	3.4428393886740447
1992	6.1728672198715575
1993	7.5560281242861915
1994	5.042524524695091
1995	8.831491671972854
1996	15.341321180619062
1997	12.895170410077316
1998	13.663080669711855
1999	14.968292495977426
2000	14.3324858845676
2001	13.603127133432908
2002	12.94466238176043
2003	11.029141070434658
2004	7.225332930099953
2005	13.335758224978536
2006	10.540274440848444
2007	12.38102216046919
2008	10.705301652825437
2009	12.190012437956348
2010	14.518308552248236
2011	15.235264918493744
2012	15.258138340305901
2013	14.358703622068871
2014	16.077891030174655
2015	14.76014646450797
2016	16.286100364576107
2017	17.62768268814949
2018	18.599845953113373
2019	17.520532656900514
2020	17.520532631603057