-51.33% is the change from 637 to 310
Calculation steps:
[( 310 - 637 ) ÷ 637] x 100 = -51.33%
Formula
Percentage change = [(310 - 637) / 637] x 100
Subtract the new number by the original number
310 - 637 = -327
-327 ÷ 637 = -0.5133437990580848
-0.5133437990580848 x 100 = -51.33%