-73.58% is the change from 670 to 177
Calculation steps:
[( 177 - 670 ) ÷ 670] x 100 = -73.58%
Formula
Percentage change = [(177 - 670) / 670] x 100
Subtract the new number by the original number
177 - 670 = -493
-493 ÷ 670 = -0.735820895522388
-0.735820895522388 x 100 = -73.58%