Year	% of total exports
1995	53.161233865675094
1996	53.283803000841424
1997	51.34028786478269
1998	48.97177161834223
1999	47.254280279010615
2000	29.017235319994377
2001	30.729825147026148
2002	26.24201167927012
2003	30.483870318613942
2004	35.10774625199887
2005	35.286396711226516
2006	35.6594555663896
2007	33.87171041326514
2008	25.3617195281923
2009	21.662437468252588
2010	21.448408186885175
2011	20.370988289895433
2012	19.830221680624067
2013	18.78422348234884
2014	58.89924133107417
2015	59.73481982944024
2016	65.97738877897493
2017	70.26435150375198
2018	61.75094394158044