-96.25% is the change from 666 to 25
Calculation steps:
[( 25 - 666 ) ÷ 666] x 100 = -96.25%
Formula
Percentage change = [(25 - 666) / 666] x 100
Subtract the new number by the original number
25 - 666 = -641
-641 ÷ 666 = -0.9624624624624625
-0.9624624624624625 x 100 = -96.25%