-91.45% is the change from 643 to 55
Calculation steps:
[( 55 - 643 ) ÷ 643] x 100 = -91.45%
Formula
Percentage change = [(55 - 643) / 643] x 100
Subtract the new number by the original number
55 - 643 = -588
-588 ÷ 643 = -0.9144634525660964
-0.9144634525660964 x 100 = -91.45%