The decline was led by the exports of non-monetary gold, integrated circuits and specialized machinery, which fell by 81.4 percent, 33.8 percent and 27.3 percent year on year, respectively.
In a breakdown, the electronic exports of Singapore to Chinese mainland decreased by 33.8 percent year on year, while the non-electronic exports went down 20.3 percent.
NODX to the majority of Singapore's top markets decreased in May, except the United States.
Singapore's total NODX dropped by 15.9 percent year on year in May, after the recalculated 10-percent decrease in April.
On a month-on-month seasonally adjusted basis, the NODX rose by 6.2 percent in May to 14.1 billion Singapore dollars (about 10.29 billion U.S. dollars).
In a breakdown of Singapore's total NODX, electronic exports declined by 31.4 percent year on year, following the 16.3-percent decrease in the previous month.
Meanwhile, non-electronic exports decreased by 10.8 percent year on year, after the revised 8-percent decrease in April.