-50.47% is the change from 321 to 159
Calculation steps:
[( 159 - 321 ) ÷ 321] x 100 = -50.47%
Formula
Percentage change = [(159 - 321) / 321] x 100
Subtract the new number by the original number
159 - 321 = -162
-162 ÷ 321 = -0.5046728971962616
-0.5046728971962616 x 100 = -50.47%