The number crunchers over at the Pew Research Center have released another batch of market statistics today, this time, with a focus on tablets. According to the Center's latest survey, 19 percent of all adult Americans now own some form of tablet, marking a nearly twofold increase over figures from a poll conducted in mid-December. E-reader ownership, meanwhile, increased by exactly the same margin over this period, jumping from 10 percent to 19 percent.