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[–] mundania ago 

The satisfied and unsatisfied percentages don’t have to add to 100 because of “not sure” answers - in fact they only do for a few rows, one of which is the one you’re looking at.

If Gallup didn’t calculate the net satisfied the way they did, some of the results would be very misleading. For example “The nation’s energy policies” and “Our system of government and how well it works” are at 44% and 43% satisfied, which makes them look really close. But the “net satisfied” numbers are +3 and -14, telling us that a lot more people see a problem with one than the other.