-49.22% is the change from 321 to 163
Calculation steps:
[( 163 - 321 ) ÷ 321] x 100 = -49.22%
Formula
Percentage change = [(163 - 321) / 321] x 100
Subtract the new number by the original number
163 - 321 = -158
-158 ÷ 321 = -0.49221183800623053
-0.49221183800623053 x 100 = -49.22%