-15.86% is the change from 971 to 817
Calculation steps:
[( 817 - 971 ) ÷ 971] x 100 = -15.86%
Formula
Percentage change = [(817 - 971) / 971] x 100
Subtract the new number by the original number
817 - 971 = -154
-154 ÷ 971 = -0.15859938208032956
-0.15859938208032956 x 100 = -15.86%