-4.04% is the change from 669 to 642
Calculation steps:
[( 642 - 669 ) ÷ 669] x 100 = -4.04%
Formula
Percentage change = [(642 - 669) / 669] x 100
Subtract the new number by the original number
642 - 669 = -27
-27 ÷ 669 = -0.04035874439461883
-0.04035874439461883 x 100 = -4.04%