Errata

Yeah, eh, see there was a comment questioning the numbers I mentioned in this post. Regarding this error, initial investigations reveal that 100 is the problem. I.e., I forgot to carry the 100. I believe that the death rate should be quoted per 100 000 rather than per 1000. Apologies. This will probably happen again at some stage. So, its 9/100000 for the construction working, and 17/100000 for the licenseholders. I think that makes better sense. Stephen?