-75.3% is the change from 328 to 81
Calculation steps:
[( 81 - 328 ) ÷ 328] x 100 = -75.3%
Formula
Percentage change = [(81 - 328) / 328] x 100
Subtract the new number by the original number
81 - 328 = -247
-247 ÷ 328 = -0.7530487804878049
-0.7530487804878049 x 100 = -75.3%