Linear TV viewing figures are set to drop worldwide for the first time next year, with online video consumption set to rise by 23.3 per cent in 2015, according to a report by ZenithOptimedia. The Publicis Groupe-owned media agency's Online Video Forecasts report found that the market will expand by a further 19.8 per cent in 2016. ZenithOptimedia also claims the number of linear TV viewers will begin to decline in 2016 for the first time, after a peak this year.