Firstly, The entire paper is guesswork. There are no official numbers to support the fact that legalising prostitution increases the victim count. I just finished reading it and they even in the beginning state that they don’t have the data.
Secondly, I was just making a point that in these kinds of researches a % value is IMO a better measurement
> If it the trend was to increase by 30% but dropped afterwards to 20% then again it has worked in some way.
Only of you have some real reason to expect the number to increase by 30%. Just looking at a trend is not enough.