In 2017, an electronic Medicine Book for pigs (eMB-Pigs) was launched by levy body Agriculture and Horticulture Development Board.[136] eMB-Pigs provides a centralised electronic version of the existing paper or electronic medicine book kept on farms, and allows pig producers to record and quantify their individual use of medicines for easy review with the veterinary surgeon, at the same time as capturing use on each farm so that data can be collated to provide national usage figures. After it became a requirement of Red Tractor farm assurance for pigs[137] that annual, aggregated records of antibiotic use must be logged on the eMB system, data released May 2018 showed that according to records covering 87% of the UK slaughter pig population, antibiotic use had halved between 2015 and 2017,[138] Data for 2018 confirms that overall antibiotic use in the UK pig sector fell further, by 60% from the estimated 2015 figure,[139] to 110 mg/kg. Use of Highest Priority Critically Important Antibiotics also fell to 0.06 mg/kg,[140] a reduction of 95% from 2015, with use of colistin almost nil.