-3.9% is the change from 667 to 641
Calculation steps:
[( 641 - 667 ) ÷ 667] x 100 = -3.9%
Formula
Percentage change = [(641 - 667) / 667] x 100
Subtract the new number by the original number
641 - 667 = -26
-26 ÷ 667 = -0.038980509745127435
-0.038980509745127435 x 100 = -3.9%