-2.96% is the change from 642 to 623
Calculation steps:
[( 623 - 642 ) ÷ 642] x 100 = -2.96%
Formula
Percentage change = [(623 - 642) / 642] x 100
Subtract the new number by the original number
623 - 642 = -19
-19 ÷ 642 = -0.029595015576323987
-0.029595015576323987 x 100 = -2.96%