Year	% of total merchandise exports
1960	10.377358490566039
1961	9.156976744186046
1962	4.0306005937428635
1971	66.98473282442748
1972	36.07011070110701
1973	28.482515764474652
1981	1.4656611746396153
1982	3.696163200937283
1983	4.749735851786113
1984	3.9905305383720493
1985	1.429190125595496
1986	1.1317349636400043
1987	1.2526355099924023
1988	1.294641739388348
1989	2.5897539199839494
1990	6.456566661609838
1991	5.441490963132982
1992	9.253482218749143
1993	13.345051302124947
1994	14.695952362277168
1995	13.9849742328485
1996	11.143715609197587
1997	13.599804815136357
1998	18.571676925629184
1999	20.739018240995044
2000	22.609517722164895
2001	19.464199921314318
2002	17.898147016449126
2003	18.909023646519497
2004	20.58240820863784
2005	21.679851701678402
2006	20.2037013502901
2007	19.583005212106443
2008	19.858599492593072
2009	20.022948082615283
2010	22.174103825353132
2011	24.00817494243904
2012	24.575194925914946
2013	22.56409668409156
2014	21.253620664606192
2015	19.745847630427864
2016	21.153798300557007
2017	25.48659021761017
2018	26.320245487428096
2019	24.477436747833327
2020	24.721038472785654