-51.1% is the change from 634 to 310
Calculation steps:
[( 310 - 634 ) ÷ 634] x 100 = -51.1%
Formula
Percentage change = [(310 - 634) / 634] x 100
Subtract the new number by the original number
310 - 634 = -324
-324 ÷ 634 = -0.5110410094637224
-0.5110410094637224 x 100 = -51.1%