Estimating STR growth over last few decades

[Greg D.]

I live in a small coastal tourist town that has had lots of vacation rentals for a long time. There is town ordnance being proposed to regulate short term rentals and the growth of online sites (Air BNB, VRBO) is being blamed for a couple noise complaints that are nothing new nor happening at an increased rate. 

I would like to demonstrate the growth of STRs relative to the growth of the rest of the town but I am having trouble finding a data source for the number of STRs over the past 10,20,30 years. Does anyone have any ideas where I can dig this up?