I did not know this. Not doubting you, just would love to see a source for this one.
Think it was this one
If not, it’s one of the other links in post 270. You might note the map here, Illinois is the 51st state, they include DC
Different sources will give slightly different numbers, but in totals and per capita, it’s a serious problem. You could also look at the two wiki links, one for spending, one for taxes paid. Should note that like NY and NJ, Illinois is also a high income state, thus sending more per capita than low income states to DC. It will provide a powerful political arguement. Which isn’t needed in Illinois, but without other high tax midwestern states, Trump would not be President.