-51.22% is the change from 658 to 321
Calculation steps:
[( 321 - 658 ) ÷ 658] x 100 = -51.22%
Formula
Percentage change = [(321 - 658) / 658] x 100
Subtract the new number by the original number
321 - 658 = -337
-337 ÷ 658 = -0.5121580547112462
-0.5121580547112462 x 100 = -51.22%