Stephen Bosch and Kittie Henderson have published "Fracking the Ecosystem: Periodicals Price Survey 2016" in Library Journal.
Here's an excerpt:
Accordingly, we have measured the 2015 price increases of more than 5,000 e-journal packages handled by EBSCO. Our analysis indicates an average e-journal package price increase of 5.8% to 6.3%, down slightly from last year's average of 6.6%.