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Grim numbers for the Washington Post today from the Audit Bureau of Circulations, which reports that both the Post‘s daily and Sunday editions are facing big circulation drops.

The paper’s Sunday edition circulation saw a whopping 20.2 percent decline, from 846,019 copies in September 2011 to 674,751 in September 2012. In fact, that drop should be a little less steep, Poynter’s Andrew Beaujon writes, because a dispute over an advertising supplement eliminated about 100,000 copies from the bureau’s report that had been counted in the 2011 audit. Instead, according to Poynter, the Sunday drop is around 7 percent.

The Post‘s daily circulation took a beating too, dropping from 507,465 issues in September 2011 to 462,228 copies in September 2012. That’s an 8.9 percent yearly decline, and bad news for a paper that already has serious revenue issues.