-83.96% is the change from 561 to 90
Calculation steps:
[( 90 - 561 ) ÷ 561] x 100 = -83.96%
Formula
Percentage change = [(90 - 561) / 561] x 100
Subtract the new number by the original number
90 - 561 = -471
-471 ÷ 561 = -0.839572192513369
-0.839572192513369 x 100 = -83.96%