-15.09% is the change from 636 to 540
Calculation steps:
[( 540 - 636 ) ÷ 636] x 100 = -15.09%
Formula
Percentage change = [(540 - 636) / 636] x 100
Subtract the new number by the original number
540 - 636 = -96
-96 ÷ 636 = -0.1509433962264151
-0.1509433962264151 x 100 = -15.09%