-34.89% is the change from 321 to 209
Calculation steps:
[( 209 - 321 ) ÷ 321] x 100 = -34.89%
Formula
Percentage change = [(209 - 321) / 321] x 100
Subtract the new number by the original number
209 - 321 = -112
-112 ÷ 321 = -0.34890965732087226
-0.34890965732087226 x 100 = -34.89%