-85.83% is the change from 635 to 90
Calculation steps:
[( 90 - 635 ) ÷ 635] x 100 = -85.83%
Formula
Percentage change = [(90 - 635) / 635] x 100
Subtract the new number by the original number
90 - 635 = -545
-545 ÷ 635 = -0.8582677165354331
-0.8582677165354331 x 100 = -85.83%