Its 51%, comrade.
http://www.businessweek.com/bwdaily/dnflash/jan2006/nf20060113_8346_db039.htm
"Gazprom, after all, isn't just any company. With hydrocarbon reserves equivalent to 119 billion barrels of oil and a market capitalization of $150 billion, Gazprom, which is 51% state-owned, is the world's largest listed energy company in terms of reserves and the biggest company in emerging markets by capitalization. Yet thanks to legal restrictions imposed by the Russian government in 1997, international investors couldn't get their hands on it."
The ownership breakdown has been posted here NUMEROUS times as has the press releases regarding liquidation of the remaining state percentages.