No, it's just that you didn't quote the entire sentence. Here it is:
A big reason for such a huge sum is that 1,807 of the federal governments public relations workers are paid $100,000 or more, up from 1,501 in 2012.
There were 1,501 PR workers paid $11k or more in 2012 and now there are 1,807 PR workers paid $100k or more. That's an increase in the number of PR workers in fedgov who are paid $100k or more.
Thanks. 8>) Must be my tired eyes.