Year	% of merchandise exports
1970	22.779210394716195
1971	25.187222118283916
1972	28.510717592132924
1974	30.844999904012504
1976	30.750417453370197
1977	27.542422489134076
1978	27.060609613806363
1997	27.574598861689413
2000	28.53894501689479
2001	28.040244179406628
2002	27.500441503977594
2003	27.593924908741542
2006	31.657675052608575
2007	31.699473856753013
2008	30.18405296751142
2009	29.25680772036279
2010	27.666811465100864
2011	29.518273701226352
2012	26.689306089576963
2013	28.334219825457115
2014	33.06217868872082
2015	24.875195583017984
2016	27.33675323148304
2017	29.66041586937
2018	32.740364296832034
2019	30.650228572412487
2020	29.657262178648583
2021	29.366719046211724
2022	30.72309621157439