By: Mark Glennon* If you understand nothing else about Chicago’s budget, learn these few, basic numbers on its pensions and property taxes. The chart below is from the city’s new proposed budget and reflects the historic property tax increase everybody is fretting about. It shows that 60.7% — about $786 million — of those taxes are budgeted to go to pensions in the coming year. But remember that’s not nearly enough for the pensions. The city would have to be contributing $1.7 billion, not $786 million, to begin funding its four pensions properly, and even