-51.18% is the change from 635 to 310
Calculation steps:
[( 310 - 635 ) ÷ 635] x 100 = -51.18%
Formula
Percentage change = [(310 - 635) / 635] x 100
Subtract the new number by the original number
310 - 635 = -325
-325 ÷ 635 = -0.5118110236220472
-0.5118110236220472 x 100 = -51.18%