-30.41% is the change from 957 to 666
Calculation steps:
[( 666 - 957 ) ÷ 957] x 100 = -30.41%
Formula
Percentage change = [(666 - 957) / 957] x 100
Subtract the new number by the original number
666 - 957 = -291
-291 ÷ 957 = -0.30407523510971785
-0.30407523510971785 x 100 = -30.41%