-85.2% is the change from 608 to 90
Calculation steps:
[( 90 - 608 ) ÷ 608] x 100 = -85.2%
Formula
Percentage change = [(90 - 608) / 608] x 100
Subtract the new number by the original number
90 - 608 = -518
-518 ÷ 608 = -0.8519736842105263
-0.8519736842105263 x 100 = -85.2%