As promised, we’re taking a closer look at the volume of exports of soybeans from the United States to China today, where we find that 2016 is on track to break all previous records. The following chart reveals what we found when we extracted the U.S. Census Bureau’s data on the value of U.S. soybean exports to China for each month from January 2012 through the just reported month of October 2016 and the average monthly price per bushel of soybeans over all that time to estimate the equivalent number of bushels of soybeans being shipped from U.S. farms to Chinese consumers.

The biggest takeaway from the chart is that the volume of U.S. soybean exports to China in 2016 is well ahead of what was recorded in recent years, and most importantly where the calculation of real, inflation-adjusted GDP growth is concerned, well ahead of what was recorded in 2015.

In fact, the outsize volume of soybean exports in July through September 2016 is a major reason why real U.S. GDP growth in the third quarter of 2016 was so unexpectedly strong.

Neil Dutta, the head of US economics at Renaissance Macro, said in a note that these added 0.61 percentage points and 0.83 percentage points, respectively. That implies that GDP excluding trade and inventories rose at a 1.4% seasonally adjusted annual rate, he said.

A closer look at the trade boost to GDP shows that soybean exports were the big driver.

Earlier in October, the international trade report foretold that trade would make a big contribution to growth.

Here’s what Jeremy Lawson, chief economist at Standard Life Investments, said in a note about why soybean exports were a huge contribution to growth:

“In a normal year, US soybean exports increase strongly in the winter months after the fall harvest. The Census Bureau then smooths these spikes out through its seasonal adjustment process. This summer, however, soybean exports from South America (Argentina and Brazil are by far the world’s largest exporters) have been very weak thanks to a poor harvest, leaving US producers to fill the gap.

“The application of the normal seasonal factors to the unusually large increase in soybean exports has meant that seasonally adjusted food, feed and beverage exports are up 121% in three-month-on-three-month (3m/3m) annualized terms.”

So there’s an important seasonal distortion to the numbers — albeit a boost — that should not be overlooked.