Approximate year the business was started (spouse)
Up to Wave 26
We first asked approximate year the business was started in Founding period ( - Wave 26) (spouse). In Founding period ( - Wave 26), if you answered “7. since 1989”, you are asked together with Founded year (spouse).
Since Wave 27
With the advent of the Heisei Era, we have added Heisei as an option divided into 10 year increments and changed the variables