After climbing to a three-year high in 2012, planned job cuts announced by firms in the technology sector declined by 32 percent in 2013 as employers focused on hiring in several growing areas, including big data, cloud computing and security, according to a semiannual report on tech layoffs released today by outplacement firm Challenger, Gray & Christmas Inc. U.S.-based employers in the computer, electronics and telecommunications industries announced 56,918 planned layoffs in 2013. That's 11.2 percent of the total 509,051 job cuts recorded during the year. That also was down from a 2012 total of 83,213.  The heaviest job cutting occurred in the computer industry, where 35,136 workers were cut from payrolls. That was 24 percent fewer than the 46,164 computer-industry job cuts in 2012. Job cuts among electronics saw the biggest decline, plunging 42 percent from 14,191 in 2012 to 8,830 last year.