No. For this particular comparison, it was basically just doing two points in time. As you pointed out, occupations have evolved over time. We used a method that had been done in a previous study where we took the occupations of 1991 and did some work to basically make them comparable with 2011. It's really just two points in time. It would be interesting to map them through, but some of them go one to many and some of them go many to one.
On March 26th, 2015. See this statement in context.