First: work out the difference (decrease) between the two numbers you are comparing.
Decrease = Original Number - New Number
Then: divide the decrease by the original number and multiply the answer by 100.
% Decrease = Decrease ÷ Original Number × 100
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1) The percentage change from off peak hours to on peak hours would be a decrease of 8.8 (51.76%)
2) The percentage change from on peak hours to mid peak hours includes of an increase of 5.7 (50.44%)