-66.04% is the change from 321 to 109
Calculation steps:
[( 109 - 321 ) ÷ 321] x 100 = -66.04%
Formula
Percentage change = [(109 - 321) / 321] x 100
Subtract the new number by the original number
109 - 321 = -212
-212 ÷ 321 = -0.660436137071651
-0.660436137071651 x 100 = -66.04%