-31.41% is the change from 971 to 666
Calculation steps:
[( 666 - 971 ) ÷ 971] x 100 = -31.41%
Formula
Percentage change = [(666 - 971) / 971] x 100
Subtract the new number by the original number
666 - 971 = -305
-305 ÷ 971 = -0.3141091658084449
-0.3141091658084449 x 100 = -31.41%