First Deputy Prime Minister Dmitry Medvedev, completing the working tour of Siberia, will spend this Thursday in Novosibirsk. He will participate in the Siberian Forum of Mothers here and will call a meeting on the demographic policy. The number of Russian population totalled 142 million people as of December 1, 2007 and decreased by 220,000 people (0.16 percent) as against the start of the year. This is less than in the corresponding period in 2006 when the number of Russians dropped by 520,000 people (0.37 percent).