Year	% of total merchandise exports
1981	28.67902664983203
1982	28.75717016252247
1983	36.129980714147486
1984	57.6952187064184
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	13.966740164173949
1994	9.101751846715606
1995	1.067556481329854
1996	9.65974211966086
1997	8.138810269790438
1998	12.941240762199827
1999	17.083672666868306
2000	5.897118431102107
2001	11.181386672305136
2002	15.484738100339342
2003	21.613863112122235
2004	24.824058468757745
2005	23.560956618280784
2006	27.642994054139532
2007	40.41899429635453
2008	48.7738154052253
2009	21.037503006819655
2010	31.229476062041826
2011	29.008792754742284
2012	29.988143468744223
2013	37.093019685252884
2014	32.40425107681343
2015	25.541398594469694
2016	35.00906584736921
2017	49.61050495855498
2018	39.02406209431224
2019	39.0559159653472
2020	46.389315655339416