-76.72% is the change from 670 to 156
Calculation steps:
[( 156 - 670 ) ÷ 670] x 100 = -76.72%
Formula
Percentage change = [(156 - 670) / 670] x 100
Subtract the new number by the original number
156 - 670 = -514
-514 ÷ 670 = -0.7671641791044777
-0.7671641791044777 x 100 = -76.72%