-50.45% is the change from 662 to 328
Calculation steps:
[( 328 - 662 ) ÷ 662] x 100 = -50.45%
Formula
Percentage change = [(328 - 662) / 662] x 100
Subtract the new number by the original number
328 - 662 = -334
-334 ÷ 662 = -0.5045317220543807
-0.5045317220543807 x 100 = -50.45%