Diminishing production

Re: New well production

I have royalty interests on several properties in Karnes County, Texas with Marathon Oil. Over the past year, my royalty payments have diminished to the lowest level since I started receiving them seven years ago. They are now down to less than a third of what they were at this time last year. I’m wondering if anyone else is experiencing a similar drop. I assume this is the result of lack of bringing in new production because of the volitile oil markets and the unstable world political environment.