-3.71% is the change from 647 to 623
Calculation steps:
[( 623 - 647 ) ÷ 647] x 100 = -3.71%
Formula
Percentage change = [(623 - 647) / 647] x 100
Subtract the new number by the original number
623 - 647 = -24
-24 ÷ 647 = -0.03709428129829984
-0.03709428129829984 x 100 = -3.71%