-56.7% is the change from 321 to 139
Calculation steps:
[( 139 - 321 ) ÷ 321] x 100 = -56.7%
Formula
Percentage change = [(139 - 321) / 321] x 100
Subtract the new number by the original number
139 - 321 = -182
-182 ÷ 321 = -0.5669781931464174
-0.5669781931464174 x 100 = -56.7%