-87.21% is the change from 649 to 83
Calculation steps:
[( 83 - 649 ) ÷ 649] x 100 = -87.21%
Formula
Percentage change = [(83 - 649) / 649] x 100
Subtract the new number by the original number
83 - 649 = -566
-566 ÷ 649 = -0.8721109399075501
-0.8721109399075501 x 100 = -87.21%