Tablet sales are starting to stumble. Although worldwide tablet sales increased by 4.4 percent this year for a total of 229.6 million units, Q4 saw the first year-over-year sales decline – 3.2 percent – since the devices first became popular in 2010, according to the International Data Corporation (IDC). As expected, Apple and Samsung drew in the largest sales by far, with 21.4 million and 11 million units shipped, respectively. Although Apple continues to dominate with 28 percent of the market share, its overall sales declined by 17.8 percent.