Sales of German beer, which include the world-famous Becks, Warsteiner and Bitburger, dropped to just under 100 hectolitres (2.2 billion gallons) in 2009, a fall of 2.8 percent on the previous year.
There has been a steady downward trend in beer sales in Germany, with a small blip in 2006, when the football World Cup, hosted by Germany, boosted consumption.
Peter Hahn, from the German Brewers Federation, said he hoped the World Cup in South Africa this year, would once again spur Germans to enjoy a few ales.
"We hope that the weather this year will again play ball, that Germany does well at the World Cup and that plenty of people go to the pub or beer garden to watch the matches with a good beer," Hahn said.
The federation blamed the desperate economic situation in Germany last year for the decline. Germany, Europe's top economy, suffered a five percent contraction in 2009, the worst slump since World War II.
A longer-term trend towards less manual work and more office-based employment had also reduced Germans' after-hours thirst, the federation said.