-51.12% is the change from 671 to 328
Calculation steps:
[( 328 - 671 ) ÷ 671] x 100 = -51.12%
Formula
Percentage change = [(328 - 671) / 671] x 100
Subtract the new number by the original number
328 - 671 = -343
-343 ÷ 671 = -0.511177347242921
-0.511177347242921 x 100 = -51.12%