-21.36% is the change from 618 to 486
Calculation steps:
[( 486 - 618 ) ÷ 618] x 100 = -21.36%
Formula
Percentage change = [(486 - 618) / 618] x 100
Subtract the new number by the original number
486 - 618 = -132
-132 ÷ 618 = -0.21359223300970873
-0.21359223300970873 x 100 = -21.36%