Classify the given a piece of financial news into three classes: positive, negative, and neutral. Output must be 'positive', 'negative', or 'neutral'.

MegaFon 's subscriber base increased 16.1 % in 2009 to 50.5 million users as of December 31 , while its market share by the number of customers amounted to 24 % as of late 2009 , up from 23 % as of late 2008 , according to TeliaSonera estimates .
positive