Year	% of total exports
1996	30.861301403269625
1997	34.07498249099649
2003	43.056917552166816
2004	28.59349031427675
2005	31.62939035595481
2006	34.33793135304075
2007	33.17159379673632
2008	24.823602729085867
2009	22.988381573917195
2010	29.567332867386803
2011	34.41273846042473
2012	37.853207822180984
2013	29.827113594099586
2014	40.9136664659458
2015	42.871666405147444
2016	46.950233824785045
2017	46.021698273306995
2018	47.998251253434596
2019	43.58592839905989
2020	30.168185753627956