-74.93% is the change from 678 to 170
Calculation steps:
[( 170 - 678 ) ÷ 678] x 100 = -74.93%
Formula
Percentage change = [(170 - 678) / 678] x 100
Subtract the new number by the original number
170 - 678 = -508
-508 ÷ 678 = -0.7492625368731564
-0.7492625368731564 x 100 = -74.93%