-50.3% is the change from 328 to 163
Calculation steps:
[( 163 - 328 ) ÷ 328] x 100 = -50.3%
Formula
Percentage change = [(163 - 328) / 328] x 100
Subtract the new number by the original number
163 - 328 = -165
-165 ÷ 328 = -0.5030487804878049
-0.5030487804878049 x 100 = -50.3%