-49.59% is the change from 613 to 309
Calculation steps:
[( 309 - 613 ) ÷ 613] x 100 = -49.59%
Formula
Percentage change = [(309 - 613) / 613] x 100
Subtract the new number by the original number
309 - 613 = -304
-304 ÷ 613 = -0.49592169657422513
-0.49592169657422513 x 100 = -49.59%