-33.96% is the change from 321 to 212
Calculation steps:
[( 212 - 321 ) ÷ 321] x 100 = -33.96%
Formula
Percentage change = [(212 - 321) / 321] x 100
Subtract the new number by the original number
212 - 321 = -109
-109 ÷ 321 = -0.3395638629283489
-0.3395638629283489 x 100 = -33.96%