BEIJING, Jan 12 (Reuters) - China’s outstanding total social financing (TSF) was 284.83 trillion yuan ($44.09 trillion) at the end of December, up 13.3% from a year earlier, the central bank said on Tuesday. TSF includes off-balance-sheet forms of financing that exist outside the conventional bank lending system, such as initial public offerings, loans from trust companies and bond sales. In December, TSF fell to 1.72 trillion yuan from 2.13 trillion yuan in November. Analysts polled by Reuters had expected December TSF of 2.20 trillion yuan. ($1 = 6.4605 Chinese yuan renminbi) (Reporting by Lusha Zhang and Kevin Yao; Editing by Andrew Heavens)