Porsche sales fell by almost 20% year on year in the four months from August to November.

US sales fell 18.2%, Germany sales were off 18.6% and the rest of the world by 19%.

On average, sales were almost 19% lower than in the same period a year earlier, at around 25,000 vehicles.

"No region was spared the abrupt slowdown in automobile markets," a statement from the group cited by Agence France-Presse said.

Porsche decided to cut output by 13% in the four-month period, and to close its plant in southwestern Zuffenhausen for eight days between now and the end of January, the report noted.

Sales fell 9.7% to EUR2.15bn (US$3.15bn) in the period, which marked the start of Porsche's 2008/2009 fiscal year.

Porsche said that sales would likely be "noticeably lower" for the full fiscal year.