-51.26% is the change from 634 to 309
Calculation steps:
[( 309 - 634 ) ÷ 634] x 100 = -51.26%
Formula
Percentage change = [(309 - 634) / 634] x 100
Subtract the new number by the original number
309 - 634 = -325
-325 ÷ 634 = -0.5126182965299685
-0.5126182965299685 x 100 = -51.26%