-79.19% is the change from 615 to 128
Calculation steps:
[( 128 - 615 ) ÷ 615] x 100 = -79.19%
Formula
Percentage change = [(128 - 615) / 615] x 100
Subtract the new number by the original number
128 - 615 = -487
-487 ÷ 615 = -0.791869918699187
-0.791869918699187 x 100 = -79.19%