Year	% of total merchandise exports
1981	28.77558902912536
1982	28.75717016252247
1983	36.376321491800404
1984	59.13066465276467
1985	29.430668345854865
1986	36.25361639704984
1987	22.175637025481016
1988	31.93867137914727
1989	30.035556947022386
1990	16.67946109852992
1991	10.998120944664224
1992	6.476997578692494
1993	17.440565772953917
1994	9.101751846715606
1995	1.0701153415440565
1996	9.671346704188569
1997	8.139415286833723
1998	12.941354612420747
1999	17.085134058884073
2000	5.897118431102107
2001	11.182375234987953
2002	15.489185432058278
2003	21.614661381743336
2004	24.861848185579202
2005	23.58280020515719
2006	29.50543483905921
2007	43.379297434042776
2008	51.68242305214714
2009	27.20698718633151
2010	34.78784726150271
2011	31.388775885630704
2012	33.58499224343935
2013	44.05242842162467
2014	33.38562481539022
2015	25.564943697242658
2016	35.009177576000646
2017	50.01337710029485
2018	39.58584798931368
2019	39.92201663952273
2020	48.29750847740829