The whisper in the hallway says that 2017 was hit with the double-whammy of budget decrease by almost a million and maze count increase. 2016 supposedly had a budget rise due to a clerical error, and 2017 paid for it as a result.
Comcast is splurging hard on their parks, what with Beijing, Jurassic World, EU and Hagrid, so perhaps HHN gets a similar budget increase this year.