The figure marked the mildest drop in 20 months, it added.
Non-electronic NODX declined 6 percent year-on-year in May, while the exports of electronic products expanded 21.9 percent.
NODX to Singapore's top markets as a whole grew last month. China's Hong Kong, Malaysia, and the United States were the largest contributors to the growth.
Singapore's domestic oil exports increased 30.1 percent year-on-year in May, bringing a 14.2-percent expansion to the country's total trade.
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