> Again the empirics are:
>
> 1964.......1.00
> 1970.......1.003
> 1985.......0.982
> 1990.......1.013
> 2000.......1.037
> 2006.......0.998
Tfast. If you really want to do the empirics, what percent of the population was of working age each time. That is you have exclude people too young or too old to work, because that might make a difference, and recalculate your indexes based on percent of working class of working age working.