Year	% of total merchandise exports
1976	89.40365744351449
1977	84.47130849849538
1978	78.65189471146469
1979	80.81690058308185
1980	83.28692225141546
1981	81.51764988393501
1982	60.435474674522474
1983	60.435474676186374
1984	60.4354746794361
1985	60.43547467337935
1986	65.58642716484307
1987	66.33959399043702
1988	64.40895918105409
1989	65.1068023280722
1990	69.26995827640214
1991	69.45526110573958
1992	67.52260746406877
1993	68.15896857767356
1994	65.85630970307086
1995	66.97401308635102
1996	68.33579362615698
1997	67.44453731697894
1998	61.63083449494228
1999	61.68143744608607
2000	63.29883489689293
2001	63.59483450269351
2002	62.49003480078884
2003	60.81541854540408
2004	57.8948801623458
2005	57.83792306502937
2006	55.96318651551113
2007	53.44871697343482
2008	50.73189600850188
2009	47.12821340934573
2010	42.36271415851311
2011	47.00447030756052
2012	48.56019297252265
2013	47.4415655620085
2014	48.024259814524285
2015	47.70855894150417
2016	49.720749688477895
2017	45.214802635463315
2018	40.258668845297244
2019	40.34455160313411
2020	36.151246066523555