Year	% of total exports
1995	39.08457985799968
1996	36.11161772752156
1997	34.99675955929995
1998	31.00188112281039
1999	32.523973735178885
2000	29.484190590217462
2001	29.45345401080111
2002	28.710814495378468
2003	28.78884244719086
2004	32.491146038163
2005	32.91435490739221
2006	35.95208599851799
2007	38.073032731433614
2008	36.578180929900626
2009	37.863021204653265
2010	40.218622292470094
2011	43.956748758634845
2012	36.34471715560485
2013	36.6474351934908
2014	79.30362595887452
2015	77.60278930903931
2016	75.74923336418861
2017	77.00340035953187
2018	75.07778036732944