Year	% of total exports
1995	11.168800531734343
1996	12.036717733664737
1997	13.44570425332487
1998	12.996822668473115
1999	12.683612770299268
2000	11.607413204702189
2001	12.488231903654109
2002	13.74376421636822
2003	14.74331596065453
2004	13.10342143181381
2005	14.178404676503181
2006	13.691642218545638
2007	21.614707437637325
2008	18.243409039701948
2009	15.189529747270905
2010	14.42954142716564
2011	13.842263330599936
2012	11.822196699999116
2013	11.758974642144132
2014	11.195729748266974
2015	10.381005791888075
2016	10.725182003311645
2017	10.232341814411356
2018	10.53519995760539