-40.22% is the change from 537 to 321
Calculation steps:
[( 321 - 537 ) ÷ 537] x 100 = -40.22%
Formula
Percentage change = [(321 - 537) / 537] x 100
Subtract the new number by the original number
321 - 537 = -216
-216 ÷ 537 = -0.4022346368715084
-0.4022346368715084 x 100 = -40.22%