The market research provider found that there was also a 7% (11m litres) volume shift to low-sugar alternatives in soft drinks during this period.
Since the implementation of the sugar levy, Pepsi and Coca-Cola are the only brands to experience a small impact in volume, down -2% and -1% respectively, whilst all other major brands have seen a positive impact in volume sales.
Stephen Jacobs, Insight Director at IRI, said: “The introduction of the UK sugar levy has had a clear impact on the soft drinks category without effecting volume sales, so far.
“Good weather always leads to a rise in soft drinks sales but there is no doubt that higher prices have driven consumers to make healthier choices with one of every 13 soft drinks sold a low sugar alternative."
He added: “We look forward to seeing how the big brands can capitalise on Britain’s changing habits and harness this growth successfully.”