Year	% of total exports
1995	2.771597643389365
1996	2.4174722772570023
1997	2.1520201816347084
1998	4.471149975653301
1999	3.7991662916291595
2000	4.191655067990576
2001	4.028361403231325
2002	3.9034498161447098
2003	2.7272977781731638
2004	2.7120798922800695
2005	2.466417318217358
2006	3.196068925019271
2007	2.218291084638115
2008	2.1328816949517653
2009	4.005939450290915
2010	4.276822909703464
2011	4.575033787407489
2012	4.48144519477964
2013	0.6754658244107582
2014	0.6924431456987591
2015	0.8764509791403989
2016	1.2393607365820025
2017	0.8730066382969474
2018	1.249159569050242