-85.16% is the change from 667 to 99
Calculation steps:
[( 99 - 667 ) ÷ 667] x 100 = -85.16%
Formula
Percentage change = [(99 - 667) / 667] x 100
Subtract the new number by the original number
99 - 667 = -568
-568 ÷ 667 = -0.8515742128935532
-0.8515742128935532 x 100 = -85.16%