-7.78% is the change from 643 to 593
Calculation steps:
[( 593 - 643 ) ÷ 643] x 100 = -7.78%
Formula
Percentage change = [(593 - 643) / 643] x 100
Subtract the new number by the original number
593 - 643 = -50
-50 ÷ 643 = -0.07776049766718507
-0.07776049766718507 x 100 = -7.78%