In this instance, you should be able to achieve the result with a simple calculated field that isolates out the 80+ LVR records.
I've created some extra rows to include more scenarios as per what I understood your requirement as, and have attached the sample solution here. (v9.2 Tableau Workbook), which should work well for v9.3 or v10.0, depending on what you are using.
Here's the new sample data:
And the final result:
Is this what you were looking for?
20161003_EdwinLiam.twbx 29.7 KB