-74.33% is the change from 670 to 172
Calculation steps:
[( 172 - 670 ) ÷ 670] x 100 = -74.33%
Formula
Percentage change = [(172 - 670) / 670] x 100
Subtract the new number by the original number
172 - 670 = -498
-498 ÷ 670 = -0.7432835820895523
-0.7432835820895523 x 100 = -74.33%