-18.25% is the change from 630 to 515
Calculation steps:
[( 515 - 630 ) ÷ 630] x 100 = -18.25%
Formula
Percentage change = [(515 - 630) / 630] x 100
Subtract the new number by the original number
515 - 630 = -115
-115 ÷ 630 = -0.18253968253968253
-0.18253968253968253 x 100 = -18.25%