Baidu is china's main search engine , trend index determines popularity over there.
Based on this, 2ne1's trend index after their mama comeback perfromance spiked a little.and ,aoa,t-ara,snsd,apink all peaked during their comeback months.
It shows SNSD is by by far the most popular one thats expected
and t-ara,AOA,apink are 2nd with swapping places.Over all aoa had the most rise among the ggs in 2015 among the other ggs .