-23.79% is the change from 643 to 490
Calculation steps:
[( 490 - 643 ) ÷ 643] x 100 = -23.79%
Formula
Percentage change = [(490 - 643) / 643] x 100
Subtract the new number by the original number
490 - 643 = -153
-153 ÷ 643 = -0.2379471228615863
-0.2379471228615863 x 100 = -23.79%