We are notified of workers through Shield and Oasys. In some of these cases the causative agent is listed as "Unkown". This section is kept on the website so that the number of these can be audited. Click on "All Agents" on the right hand side to see a more useful list of causative agents.
We also group agents here where we don't know what the exposure is.
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.