-57.32% is the change from 321 to 137
Calculation steps:
[( 137 - 321 ) ÷ 321] x 100 = -57.32%
Formula
Percentage change = [(137 - 321) / 321] x 100
Subtract the new number by the original number
137 - 321 = -184
-184 ÷ 321 = -0.573208722741433
-0.573208722741433 x 100 = -57.32%