-95.35% is the change from 666 to 31
Calculation steps:
[( 31 - 666 ) ÷ 666] x 100 = -95.35%
Formula
Percentage change = [(31 - 666) / 666] x 100
Subtract the new number by the original number
31 - 666 = -635
-635 ÷ 666 = -0.9534534534534534
-0.9534534534534534 x 100 = -95.35%