The physical story of Saudi Arabia's May trade surplus begins not in a spreadsheet but at the loading terminals of Ras Tanura and Jubail, where crude oil and refined products move onto tankers bound for East Asia.

Saudi Arabia's merchandise trade surplus surged to SR26.03 billion, equivalent to $6.91 billion, in May, as merchandise exports rose 3.9 percent year on year to SR93.78 billion while imports fell 19.5 percent to SR67.75 billion, producing a surplus that widened 328.8 percent from a year earlier.

That arithmetic is striking, but the composition beneath it is more instructive than the headline.

Oil exports climbed 19.5 percent and accounted for 75.6 percent of total exports, up from 65.7 percent a year earlier.

The shift in that ratio is the detail worth pausing on. When oil's share of total exports rises by nearly ten percentage points in a single year, it tells you that the non-oil export base did not keep pace with the hydrocarbon rebound. The May data confirms this reading precisely.