-51.42% is the change from 671 to 326
Calculation steps:
[( 326 - 671 ) ÷ 671] x 100 = -51.42%
Formula
Percentage change = [(326 - 671) / 671] x 100
Subtract the new number by the original number
326 - 671 = -345
-345 ÷ 671 = -0.5141579731743666
-0.5141579731743666 x 100 = -51.42%