Year	% of merchandise exports
1962	158.4930763874515
1975	42.15156023048942
1976	50.6739133125166
1977	51.24043354129003
1978	40.782096005119165
1979	27.15377355284767
1980	44.589062753243134
1981	44.74411983298737
1982	33.8642497672263
1983	25.172942417761945
1999	32.008896974873124
2000	34.3661760797379
2001	30.251381243149773
2002	22.611602458944628
2003	24.681404919760478
2004	30.24592461455135
2005	27.645709582168088
2006	35.34094678200011
2007	38.60884574726956
2008	45.89159959039199
2009	16.765402455694993
2010	40.53392694498737
2011	35.03893773941979
2012	35.028647052816225
2013	39.02097785095358
2014	32.16095421933762
2015	37.75196078324184