-33.64% is the change from 321 to 213
Calculation steps:
[( 213 - 321 ) ÷ 321] x 100 = -33.64%
Formula
Percentage change = [(213 - 321) / 321] x 100
Subtract the new number by the original number
213 - 321 = -108
-108 ÷ 321 = -0.3364485981308411
-0.3364485981308411 x 100 = -33.64%