-49.6% is the change from 619 to 312
Calculation steps:
[( 312 - 619 ) ÷ 619] x 100 = -49.6%
Formula
Percentage change = [(312 - 619) / 619] x 100
Subtract the new number by the original number
312 - 619 = -307
-307 ÷ 619 = -0.49596122778675283
-0.49596122778675283 x 100 = -49.6%