-85.55% is the change from 623 to 90
Calculation steps:
[( 90 - 623 ) ÷ 623] x 100 = -85.55%
Formula
Percentage change = [(90 - 623) / 623] x 100
Subtract the new number by the original number
90 - 623 = -533
-533 ÷ 623 = -0.85553772070626
-0.85553772070626 x 100 = -85.55%