Report on desired compensation? Are you serious? What if 2 folks come in and say they want $300k based on their current salaries? What will you do then? You may argue that it is the market salary then but if I were an employer, I wouldn't even invite Google/FB folks for the interview but only inexperienced folks - to game the desired salary requirement.
This is why this requires a more thoughtful approach..
Monetary compensation data, of course, would be for the /field/ and collected via the tax infrastructure. Median for /that type of work/ not based on those interviewed. The reason for having the interviewees report back is to check on if the expectations for the job match the description for the job.
* last at least a year
* pay at least 150% of median market rate
* have been open and unfulfilled with at least 10 who are interviewed AND report on their desired compensation for the role
* Eliminated non-hourly work* ('Salaried' would be a contract to buy between X and Y hours of work per year, with limits of hours per day/week etc.)