-2.86% is the change from 630 to 612
Calculation steps:
[( 612 - 630 ) ÷ 630] x 100 = -2.86%
Formula
Percentage change = [(612 - 630) / 630] x 100
Subtract the new number by the original number
612 - 630 = -18
-18 ÷ 630 = -0.02857142857142857
-0.02857142857142857 x 100 = -2.86%