-85.38% is the change from 677 to 99
Calculation steps:
[( 99 - 677 ) ÷ 677] x 100 = -85.38%
Formula
Percentage change = [(99 - 677) / 677] x 100
Subtract the new number by the original number
99 - 677 = -578
-578 ÷ 677 = -0.8537666174298375
-0.8537666174298375 x 100 = -85.38%