Year	% of total exports
1995	46.78727386150967
1996	50.10438413361169
1997	28.224742811922976
1998	27.650547734132598
1999	25.41128637578587
2000	25.411951558467344
2001	23.636936653009773
2002	25.647114699596298
2003	20.432487655372043
2004	18.14280140460398
2005	13.221392212599985
2006	18.284453860776946
2007	24.384296513045598
2008	39.25007698174057
2009	40.23185367211469
2010	37.6825937109437
2011	34.76430450867481
2012	33.66370139231628
2013	34.84573831765121
2014	34.77493517772757
2015	34.84391836881308
2016	31.072336173892197
2017	27.637850535878734
2018	34.8377700548808