Year	% of total exports
2002	0.6509253815594401
2003	0.6232880121771521
2004	0.7869876500713437
2005	1.8494977153561614
2006	2.3167770257764406
2007	3.089602401875632
2008	4.1109257410619024
2009	3.25373583102332
2010	16.803171335795156
2011	17.51770626875703
2012	21.84804368386465
2013	24.892572843870433
2014	26.331373225035314
2015	17.703449094962277
2016	16.631028660487978
2017	15.25381266660775
2018	15.310070414490815
2019	14.402959481051816
2020	7.266729325686589