-67.8% is the change from 531 to 171
Calculation steps:
[( 171 - 531 ) ÷ 531] x 100 = -67.8%
Formula
Percentage change = [(171 - 531) / 531] x 100
Subtract the new number by the original number
171 - 531 = -360
-360 ÷ 531 = -0.6779661016949152
-0.6779661016949152 x 100 = -67.8%