-2.44% is the change from 655 to 639
Calculation steps:
[( 639 - 655 ) ÷ 655] x 100 = -2.44%
Formula
Percentage change = [(639 - 655) / 655] x 100
Subtract the new number by the original number
639 - 655 = -16
-16 ÷ 655 = -0.024427480916030534
-0.024427480916030534 x 100 = -2.44%