Year	% of total exports
1997	13.054830287206268
1998	34.425736620565246
1999	23.975109809663252
2000	12.64364959238344
2001	15.7045695263372
2002	14.513094122337932
2003	13.738010376673248
2004	12.855999385453309
2005	13.337658550730257
2006	14.44059830413971
2007	13.912372635354181
2008	13.803691096624329
2009	16.870794426299074
2010	18.269270275962842
2011	20.393482054728533
2012	25.99202908886965
2013	26.716126743263874
2014	28.016671910300133
2015	33.54528797583684
2016	37.47329043134457
2017	39.298768568982275
2018	39.54311863891237
2019	37.198561497250864
2020	9.887580713235415