-60.12% is the change from 321 to 128
Calculation steps:
[( 128 - 321 ) ÷ 321] x 100 = -60.12%
Formula
Percentage change = [(128 - 321) / 321] x 100
Subtract the new number by the original number
128 - 321 = -193
-193 ÷ 321 = -0.6012461059190031
-0.6012461059190031 x 100 = -60.12%