Year	% of merchandise exports
1978	23.21852277341464
2007	35.9485412098036
2009	36.98656361453467
2010	32.591671421750874
2011	34.36787610851167
2012	30.059969476114023
2013	31.02275698013248
2014	42.339435722847114
2015	28.889238506562847
2016	34.73186450927767
2017	37.004349754972274
2018	36.65858833431138
2019	37.70500251435351