-51.18% is the change from 678 to 331
Calculation steps:
[( 331 - 678 ) ÷ 678] x 100 = -51.18%
Formula
Percentage change = [(331 - 678) / 678] x 100
Subtract the new number by the original number
331 - 678 = -347
-347 ÷ 678 = -0.5117994100294986
-0.5117994100294986 x 100 = -51.18%