-18.73% is the change from 630 to 512
Calculation steps:
[( 512 - 630 ) ÷ 630] x 100 = -18.73%
Formula
Percentage change = [(512 - 630) / 630] x 100
Subtract the new number by the original number
512 - 630 = -118
-118 ÷ 630 = -0.1873015873015873
-0.1873015873015873 x 100 = -18.73%