-90.19% is the change from 642 to 63
Calculation steps:
[( 63 - 642 ) ÷ 642] x 100 = -90.19%
Formula
Percentage change = [(63 - 642) / 642] x 100
Subtract the new number by the original number
63 - 642 = -579
-579 ÷ 642 = -0.9018691588785047
-0.9018691588785047 x 100 = -90.19%