-51.02% is the change from 635 to 311
Calculation steps:
[( 311 - 635 ) ÷ 635] x 100 = -51.02%
Formula
Percentage change = [(311 - 635) / 635] x 100
Subtract the new number by the original number
311 - 635 = -324
-324 ÷ 635 = -0.510236220472441
-0.510236220472441 x 100 = -51.02%