-82.39% is the change from 971 to 171
Calculation steps:
[( 171 - 971 ) ÷ 971] x 100 = -82.39%
Formula
Percentage change = [(171 - 971) / 971] x 100
Subtract the new number by the original number
171 - 971 = -800
-800 ÷ 971 = -0.82389289392379
-0.82389289392379 x 100 = -82.39%