Year	% of total exports
1998	3.919679312089032
1999	3.9302742652263287
2000	3.7893830057551403
2001	3.809551756914236
2002	4.48275876212291
2003	3.6996670588443097
2004	4.1854167053670395
2005	4.216476539989436
2006	4.336758545788901
2007	4.622940338092571
2008	4.7710963241099345
2009	5.32152177760431
2010	5.795818002886298
2011	6.270548007010151
2012	6.5439893336013615
2013	6.943915389414951
2014	7.463110861916822
2015	7.010745169413216
2016	6.30570515558945
2017	5.921903552091537
2018	6.210802052697222
2019	5.069064188051002