English Bus/Financial Business/Commerce (general)

As per the 99-yare Skyway Concession Agent, the purchasers of the Skyway, are entitled to a 6.5% compound annual return until 2017, after which they are entitled to increase the toll by the greater of CPI, Nominal GCP/capita or 2% a year.

I could not find this expression anywhere.
Could it be a typo?

Thank you,
Laura