-50.08% is the change from 613 to 306
Calculation steps:
[( 306 - 613 ) ÷ 613] x 100 = -50.08%
Formula
Percentage change = [(306 - 613) / 613] x 100
Subtract the new number by the original number
306 - 613 = -307
-307 ÷ 613 = -0.5008156606851549
-0.5008156606851549 x 100 = -50.08%