-2.9% is the change from 656 to 637
Calculation steps:
[( 637 - 656 ) ÷ 656] x 100 = -2.9%
Formula
Percentage change = [(637 - 656) / 656] x 100
Subtract the new number by the original number
637 - 656 = -19
-19 ÷ 656 = -0.028963414634146343
-0.028963414634146343 x 100 = -2.9%