-3.38% is the change from 680 to 657
Calculation steps:
[( 657 - 680 ) ÷ 680] x 100 = -3.38%
Formula
Percentage change = [(657 - 680) / 680] x 100
Subtract the new number by the original number
657 - 680 = -23
-23 ÷ 680 = -0.033823529411764704
-0.033823529411764704 x 100 = -3.38%