-77.14% is the change from 643 to 147
Calculation steps:
[( 147 - 643 ) ÷ 643] x 100 = -77.14%
Formula
Percentage change = [(147 - 643) / 643] x 100
Subtract the new number by the original number
147 - 643 = -496
-496 ÷ 643 = -0.7713841368584758
-0.7713841368584758 x 100 = -77.14%