-15.5% is the change from 613 to 518
Calculation steps:
[( 518 - 613 ) ÷ 613] x 100 = -15.5%
Formula
Percentage change = [(518 - 613) / 613] x 100
Subtract the new number by the original number
518 - 613 = -95
-95 ÷ 613 = -0.15497553017944535
-0.15497553017944535 x 100 = -15.5%