-49.92% is the change from 619 to 310
Calculation steps:
[( 310 - 619 ) ÷ 619] x 100 = -49.92%
Formula
Percentage change = [(310 - 619) / 619] x 100
Subtract the new number by the original number
310 - 619 = -309
-309 ÷ 619 = -0.4991922455573506
-0.4991922455573506 x 100 = -49.92%