-91.6% is the change from 643 to 54
Calculation steps:
[( 54 - 643 ) ÷ 643] x 100 = -91.6%
Formula
Percentage change = [(54 - 643) / 643] x 100
Subtract the new number by the original number
54 - 643 = -589
-589 ÷ 643 = -0.9160186625194401
-0.9160186625194401 x 100 = -91.6%