Apple accounts for 20% of US consumer technology sales

"New data released by The NPD Group on Tuesday revealed that Apple accounted for 19.9 percent of all domestic consumer technology sales, based on revenue, from last year. That number was up from the 17.3 percent share Apple took in 2011.
Apple's revenue easily beat out rival Samsung, which came in second with 9.3 percent, up from 7 percent in 2011. The rest of the top five saw their share of revenue fall in 2012: HP dipped from 8.9 percent in 2011 to 8.2 percent last year, while Sony and Dell both slid to 4.4 percent and 3 percent, respectively."

Source:  Apple Insider, 19th February 2013