-74.55% is the change from 668 to 170
Calculation steps:
[( 170 - 668 ) ÷ 668] x 100 = -74.55%
Formula
Percentage change = [(170 - 668) / 668] x 100
Subtract the new number by the original number
170 - 668 = -498
-498 ÷ 668 = -0.7455089820359282
-0.7455089820359282 x 100 = -74.55%