-81.98% is the change from 949 to 171
Calculation steps:
[( 171 - 949 ) ÷ 949] x 100 = -81.98%
Formula
Percentage change = [(171 - 949) / 949] x 100
Subtract the new number by the original number
171 - 949 = -778
-778 ÷ 949 = -0.8198103266596417
-0.8198103266596417 x 100 = -81.98%