Year	% of total exports
1995	30.561115264478172
1996	28.59980895719423
1997	28.776900831298132
1998	29.919617396319012
1999	30.274782596236026
2000	27.674754727723958
2001	25.246651197618945
2002	24.96532447372992
2003	24.10775027406515
2004	22.786736242788002
2005	20.70925478712443
2006	19.490729681166822
2007	19.070630718034412
2008	18.10480960955871
2013	16.225948340539478
2014	18.643206314368577
2015	22.64173412336047
2016	25.737433681535688
2017	24.130553047176406
2018	23.022847656579476