Milan, January 19 - The Milan bourse backtracked Tuesday after a buoyant opening as six banking shares were suspended on excessive volatility. The FTSE Mib index shed 0.05% after jumping 2.57% in early trading. Banco Popolare (-8.37%), MPS (-7.25%), Bper (-5.23%), UniCredit (-5.33%), BPM (-3.61%) and UBI Banca were all suspended. Asian stock markets closed positive in spite of news of a slowdown in the Chinese economy, whose 2015 GDP grew 6.9% - the lowest rate in the past 25 years. Investors in Shanghai (+3.2%) and Shenzhen (+3.6%) bet on a stimulus package from the Chinese government. Hong Kong added 1.6% and Tokyo closed +0.55%. Also on Tuesday, Brent crude prices rose to $29.10 a barrel after dropping to 12-year minimum on Monday as the lifting of Iran sanctions means the Islamic Republic can start exporting oil again.