-74.57% is the change from 641 to 163
Calculation steps:
[( 163 - 641 ) ÷ 641] x 100 = -74.57%
Formula
Percentage change = [(163 - 641) / 641] x 100
Subtract the new number by the original number
163 - 641 = -478
-478 ÷ 641 = -0.7457098283931357
-0.7457098283931357 x 100 = -74.57%