-34.45% is the change from 328 to 215
Calculation steps:
[( 215 - 328 ) ÷ 328] x 100 = -34.45%
Formula
Percentage change = [(215 - 328) / 328] x 100
Subtract the new number by the original number
215 - 328 = -113
-113 ÷ 328 = -0.3445121951219512
-0.3445121951219512 x 100 = -34.45%