-82.79% is the change from 523 to 90
Calculation steps:
[( 90 - 523 ) ÷ 523] x 100 = -82.79%
Formula
Percentage change = [(90 - 523) / 523] x 100
Subtract the new number by the original number
90 - 523 = -433
-433 ÷ 523 = -0.8279158699808795
-0.8279158699808795 x 100 = -82.79%