-17.57% is the change from 643 to 530
Calculation steps:
[( 530 - 643 ) ÷ 643] x 100 = -17.57%
Formula
Percentage change = [(530 - 643) / 643] x 100
Subtract the new number by the original number
530 - 643 = -113
-113 ÷ 643 = -0.17573872472783825
-0.17573872472783825 x 100 = -17.57%