-74.65% is the change from 643 to 163
Calculation steps:
[( 163 - 643 ) ÷ 643] x 100 = -74.65%
Formula
Percentage change = [(163 - 643) / 643] x 100
Subtract the new number by the original number
163 - 643 = -480
-480 ÷ 643 = -0.7465007776049767
-0.7465007776049767 x 100 = -74.65%