Year	% of merchandise exports
1974	30.570394950426582
1975	29.18849045603785
1976	30.1661287304091
1977	29.30079253678707
1978	33.59863316235641
1979	37.516269483062196
1981	41.00035615916567
1996	32.237534460260854
1997	29.543153740688165
1998	31.43990950474287
1999	31.609029840180174
2000	32.39869803018609
2001	31.629128087001167
2002	31.776604208855996
2003	31.2833654145889
2006	33.439807576748684
2007	41.0587336639973
2008	31.85113802829383
2009	39.78618114996904
2010	39.01628243631033
2011	41.065850280694264
2012	40.087214242561444
2013	39.230486454536496
2014	39.95023492496977
2015	35.753147509986434
2016	34.97485156770003
2017	38.52237981876088
2018	39.36954110348293
2019	38.577823115166474
2020	37.47778082637829
2021	36.931833427381555
2022	39.39718540213107