-76.57% is the change from 670 to 157
Calculation steps:
[( 157 - 670 ) ÷ 670] x 100 = -76.57%
Formula
Percentage change = [(157 - 670) / 670] x 100
Subtract the new number by the original number
157 - 670 = -513
-513 ÷ 670 = -0.7656716417910447
-0.7656716417910447 x 100 = -76.57%