-32.09% is the change from 321 to 218
Calculation steps:
[( 218 - 321 ) ÷ 321] x 100 = -32.09%
Formula
Percentage change = [(218 - 321) / 321] x 100
Subtract the new number by the original number
218 - 321 = -103
-103 ÷ 321 = -0.32087227414330216
-0.32087227414330216 x 100 = -32.09%