Despite a deficit of US$300 million last month the trade surplus in the first quarter was over $1 billion, the highest since 2010, official data showed.
Exports during the quarter topped $33.35 billion, a 14 percent increase year-on-year.
The trade surplus was achieved mainly due to foreign firms whose exports exceeded imports by $3.9 billion.
First-quarter shipments (excluding crude oil) by foreign firms increased by 19 percent from last year to $20.78 billion.
The items that saw a significant rise in exports included wood and wood furniture, up 23 percent, cell phones and spare parts (22.7 percent), and textile and garments (22 percent).
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