The owner of Germany’s Warsteiner brewery, the Haus Cramer Group, reported a slight increase in beer sales in the country despite a shrinking overall trend in the beer market. Domestic growth of more than 1% was achieved last year, while the German beer market shrank by around 4%, a company spokeswoman said on Thursday. The company’s core beer brand, Warsteiner, is gaining market share. The Haus Cramer Group’s foreign business grew by 11.7%, according to the company. The family-owned brewing company traditionally does not comment on turnover and profits. The number of employees remained at aro…