-78.1% is the change from 630 to 138
Calculation steps:
[( 138 - 630 ) ÷ 630] x 100 = -78.1%
Formula
Percentage change = [(138 - 630) / 630] x 100
Subtract the new number by the original number
138 - 630 = -492
-492 ÷ 630 = -0.780952380952381
-0.780952380952381 x 100 = -78.1%