-50.87% is the change from 635 to 312
Calculation steps:
[( 312 - 635 ) ÷ 635] x 100 = -50.87%
Formula
Percentage change = [(312 - 635) / 635] x 100
Subtract the new number by the original number
312 - 635 = -323
-323 ÷ 635 = -0.5086614173228347
-0.5086614173228347 x 100 = -50.87%