-7.96% is the change from 666 to 613
Calculation steps:
[( 613 - 666 ) ÷ 666] x 100 = -7.96%
Formula
Percentage change = [(613 - 666) / 666] x 100
Subtract the new number by the original number
613 - 666 = -53
-53 ÷ 666 = -0.07957957957957958
-0.07957957957957958 x 100 = -7.96%