The Volkswagen brand has reported U.S. sales of 28,444 units in June 2011 recording a 35.1 percent increase over the same month a year ago. The German firm’s year-to-date-sales are up by 22.3 percent compared to 2010 at 154,125 units.

The most impressive increase in sales comes from the new Jetta, which was introduced to the American market in October 2010. The compact sedan’s U.S. sales totaled 14,513 units in June (+120.9%) and 76,498 cars from the beginning of the year, an increase of 77.2 percent over the same period in 2010.

The firm’s Touareg and Tiguan experienced 46.9 percent and 47.1 percent sales increases, respectively, while the hardtop-convertible Eos’ sales grew 17.7 percent over 2010.

On the other side of the spectrum, the Chrysler-sourced Routan saw its sales drop 30.7 percent in June and 23.8 percent from the beginning of 2011.

“We’ve been able achieve a volume in the first half of this year in what took us effectively seven months last year,” said Jonathan Browning, President and CEO, Volkswagen of America, Inc. “With Volkswagen’s broad range of fuel-efficient, high-quality vehicles, we expect the momentum to continue into the second-half of the year,” he added.