-40.93% is the change from 518 to 306
Calculation steps:
[( 306 - 518 ) ÷ 518] x 100 = -40.93%
Formula
Percentage change = [(306 - 518) / 518] x 100
Subtract the new number by the original number
306 - 518 = -212
-212 ÷ 518 = -0.4092664092664093
-0.4092664092664093 x 100 = -40.93%