Cars drive past the Opel plant in Bochum April 17, 2013.?[Photo/Agencies]

FRANKFURT?- General Motors brands Opel and Vauxhall increased their market share in Europe in 2013, as sales of the new Adam city car helped counter a declining auto market.

Opel has struggled to retain market share in recent years, suffering from management disruption and a scarcity of new products.

It launched the Adam a year ago in an attempt to recover in Europe, where an economic crisis has steered customers toward smaller, cheaper-to-run cars.

Opel and UK sister brand Vauxhall had a European market share of 5.61 percent in 2013, up from 5.59 percent in 2012, Opel said on Monday, citing preliminary sales figures.

In Germany - Europe's biggest auto market - Opel expanded its market share to 7 percent from 6.9 percent, it said.

The increase comes amid a continued decline in overall sales in Europe, where the auto market is expected to have contracted by 25 percent, or 4.3 million vehicles, in 2013 from 2007 levels, analysts at Moody's Investors Service said.

Pan-European sales figures for different brands have not yet been published. The European Automobile Manufacturers Association is set to release European car registration figures for 2013 on January 16.

Peter Christian Kuespert, Opel's vice-president of sales and after-sales, said the introduction of the Adam had helped boost deliveries.

Sales of the city car exceeded expectations, recording 21,000 new registrations in Germany in 2013, he said. Sales of the Mokka compact offroader reached around 20,000.

Opel's current Corsa subcompact was launched in 2006, making it one of the oldest products being offered in European showrooms where it competes with the Ford Fiesta, the Peugeot 208 and the Renault Clio. Corsa sales fell 14 percent in 2012.