Isopropyl alcohol is a common solvent and is not recorded as a cause of occupational asthma, although many workers attribute their asthma to it. The cause is more likely to be something dissolved in the isopropyl alcohol
The Oasys Audit scheme started midway through 2010 and collects agents typed in through the Oasys program. The years before 2010 show old data entered during 2010 or later and are likely to have many fewer notifications. We expect Oasys to become more widely adopted as time goes by so increasing notifications does not necessarily mean an increasing problem.