-77.45% is the change from 643 to 145
Calculation steps:
[( 145 - 643 ) ÷ 643] x 100 = -77.45%
Formula
Percentage change = [(145 - 643) / 643] x 100
Subtract the new number by the original number
145 - 643 = -498
-498 ÷ 643 = -0.7744945567651633
-0.7744945567651633 x 100 = -77.45%