Notice that USPS employees owe 10% of the total amount.
The other 90% are owed by all the other agencies.
So, think about it a minute ~ how many USPS employees are there and how many "other" government employees are there, and how much does each owe.
I think you get the picture ~ USPS has about 750,000. There were, in 2008, 4,208,000 federal military and civilian employees (including USPS). We end up with: USPS employees, a mere 17.8% of the total federal workforce, owing 10% of the taxes outstanding, and all the others, constituting 82.2% owing the other 90%.
The implication is clear, the 17.8% who owe 10% are almost twice as dedicated to paying their taxes than all the others.
I suspect your government paid doctors will be riffling through your pockets for loose change once they get you dressed out for serious gut surgery.
But feeding outrage, not "higher math" is the staple at Fox News where they leave such ciphering to the pointy heads and instead concentrate on supplying a lovely assortment of short-skirted news babes.