-50.71% is the change from 637 to 314
Calculation steps:
[( 314 - 637 ) ÷ 637] x 100 = -50.71%
Formula
Percentage change = [(314 - 637) / 637] x 100
Subtract the new number by the original number
314 - 637 = -323
-323 ÷ 637 = -0.5070643642072213
-0.5070643642072213 x 100 = -50.71%