-1.94% is the change from 670 to 657
Calculation steps:
[( 657 - 670 ) ÷ 670] x 100 = -1.94%
Formula
Percentage change = [(657 - 670) / 670] x 100
Subtract the new number by the original number
657 - 670 = -13
-13 ÷ 670 = -0.019402985074626865
-0.019402985074626865 x 100 = -1.94%