-58.21% is the change from 615 to 257
Calculation steps:
[( 257 - 615 ) ÷ 615] x 100 = -58.21%
Formula
Percentage change = [(257 - 615) / 615] x 100
Subtract the new number by the original number
257 - 615 = -358
-358 ÷ 615 = -0.5821138211382114
-0.5821138211382114 x 100 = -58.21%