-77.01% is the change from 670 to 154
Calculation steps:
[( 154 - 670 ) ÷ 670] x 100 = -77.01%
Formula
Percentage change = [(154 - 670) / 670] x 100
Subtract the new number by the original number
154 - 670 = -516
-516 ÷ 670 = -0.7701492537313432
-0.7701492537313432 x 100 = -77.01%