The 62% is the rise the difficulty took in the last 30 days, the stats for this is in the upper left. And i fear it might get even worse. I mean avalon batch 3 miners will ship in the next weeks for sure, the hundred thousand of avalon chips will be shipped in the next weeks, those chips can be overclocked from 282mhz to 450 mhz with burnin's design, which means an even greater rise of difficulty. And then there are all the new chips that should come out. Im not even remembering all the new companies claiming to bring out chips in the next months. It might become hard.
Pretty soon its where you will need 1Th/s to make revenue and well that all depends on the price of the hardware which will have to really really start to come down for ROI or people will not buy these products. I truly hope people are not buying bfl mini's at 22k still..