-39.89% is the change from 534 to 321
Calculation steps:
[( 321 - 534 ) ÷ 534] x 100 = -39.89%
Formula
Percentage change = [(321 - 534) / 534] x 100
Subtract the new number by the original number
321 - 534 = -213
-213 ÷ 534 = -0.398876404494382
-0.398876404494382 x 100 = -39.89%