How to Calculate 5-Year Rent Growth

[Audrey Sommer]

I was wondering if anyone had any recommendations on how to calculate a relatively accurate 5 year rent growth for a market? I'm working through the "picking a market" worksheet and workshop, and there are no clear instructions on how to find this. i've tried googling it, and referencing my data aggregators, but usually data goes back a year, 2-3 if I'm lucky. 

Any resources and recommendations is helpful. Thanks!