In October of 2004, Venezuela raised their royalty rate from under 1% to 16.7%. There was much hand ringing, and threats that future production would be pulled, industry would suffer.
Seeing the success of the Venezuelan rise, the U.S. raised the royalty rate in the Gulf states to 16.67% in 2007. There was much worry about stifling the reign of free enterprise.
The States are notoriously slow to act in favour of a higher burden on any critical industry, but it took them 3 years to move on a higher royalty system once they saw it effectively utilized in another jurisdiction. And it wasn't even the best model, although that model hadn't had the history of success that we can now identify.
This page has shiny pictures and graphs. It's format is such that I can't simply post them here without looking into it further, but it's probably worth a quick look. It is in slideshow format, and explains quickly in a visual medium why people are going to be upset about this until it is taken into serious consideration.
http://changenowforgood.ca/albertas-...iew-royalties/