-84.75% is the change from 649 to 99
Calculation steps:
[( 99 - 649 ) ÷ 649] x 100 = -84.75%
Formula
Percentage change = [(99 - 649) / 649] x 100
Subtract the new number by the original number
99 - 649 = -550
-550 ÷ 649 = -0.847457627118644
-0.847457627118644 x 100 = -84.75%