-51.32% is the change from 645 to 314
Calculation steps:
[( 314 - 645 ) ÷ 645] x 100 = -51.32%
Formula
Percentage change = [(314 - 645) / 645] x 100
Subtract the new number by the original number
314 - 645 = -331
-331 ÷ 645 = -0.5131782945736434
-0.5131782945736434 x 100 = -51.32%