The period in question is 4 years so multiply by 4 (although not all litigants were present during all 4 years so you can back it off a little).

And 5k is too low. Google gave a 10% raise across the board around the time this information came out. So assume 150k salary * 10% = 15k. Salaries also continued to rise more rapidly after the 10% raise, but it's hard to say by how much without having access to the internal data.