-51.97% is the change from 635 to 305
Calculation steps:
[( 305 - 635 ) ÷ 635] x 100 = -51.97%
Formula
Percentage change = [(305 - 635) / 635] x 100
Subtract the new number by the original number
305 - 635 = -330
-330 ÷ 635 = -0.5196850393700787
-0.5196850393700787 x 100 = -51.97%