At the beginning of the month, the Commerce Department predicted that fourth quarter gross domestic product (GDP) figures for 2008 would show 3.8% drop . This seemed low to some economists, and it turns out it was. Today Commerce released a revised estimate. From October through December, GDP dropped at a seasonally adjusted annual rate of 6.2%--the biggest one quarter drop since 1982. This from the Bureau of Economic Analysis's news release : The decrease in real GDP in the fourth quarter primarily reflected negative contributions from exports, personal consumption expenditures, equipment and software, and residential fixed investment that were partly offset by a positive contribution from federal government spending. Imports, which are a subtraction in the calculation of GDP, decreased. Most of the major components contributed to the much larger decrease in real GDP in the fourth quarter than in the third. The largest contributors were a downturn in exports and a much larger decrease in equipment and software. The most notable offset was a much larger decrease in imports. Final sales of computers subtracted 0.01 percentage point from the fourth-quarter change in real GDP, the same contribution as in the third quarter. Motor vehicle output subtracted 2.04 percentage points from the fourth-quarter change in real GDP after adding 0.16 percentage point to the third-quarter change. Exports decreased 23.6 percent in the 4th quarter. They had risen 3% in the 3rd quarter. The one area with significant growth was government spending--up 6.7%. As noted above, the figures aren't a big surprise. As Barry Rithotlz writes in a short but clear post , " WHO THE HELL IS STILL SURPRISED BY THESE NUMBERS?!?" But Marketplace 's Steve Henn will have a report today on just how the Commerce Department got its estimates wrong. Local listings are here .