-50.92% is the change from 654 to 321
Calculation steps:
[( 321 - 654 ) ÷ 654] x 100 = -50.92%
Formula
Percentage change = [(321 - 654) / 654] x 100
Subtract the new number by the original number
321 - 654 = -333
-333 ÷ 654 = -0.5091743119266054
-0.5091743119266054 x 100 = -50.92%