Field_DevelopmentGazprom fares worst as Russian gas output fallsMost of Gazprom's competitors in Russia report better gas production in January, eating into the company's market share at homeConcerned: Gazprom chief executive Alexei Miller arrives to the upper chamber of the Russian Parliament to listen to annual address by Russian President Vladimir PutinPhoto: REUTERS/SCANPIXVladimir AfanasievMoscow