-83.73% is the change from 971 to 158
Calculation steps:
[( 158 - 971 ) ÷ 971] x 100 = -83.73%
Formula
Percentage change = [(158 - 971) / 971] x 100
Subtract the new number by the original number
158 - 971 = -813
-813 ÷ 971 = -0.8372811534500515
-0.8372811534500515 x 100 = -83.73%