-74.96% is the change from 643 to 161
Calculation steps:
[( 161 - 643 ) ÷ 643] x 100 = -74.96%
Formula
Percentage change = [(161 - 643) / 643] x 100
Subtract the new number by the original number
161 - 643 = -482
-482 ÷ 643 = -0.749611197511664
-0.749611197511664 x 100 = -74.96%