-2.42% is the change from 621 to 606
Calculation steps:
[( 606 - 621 ) ÷ 621] x 100 = -2.42%
Formula
Percentage change = [(606 - 621) / 621] x 100
Subtract the new number by the original number
606 - 621 = -15
-15 ÷ 621 = -0.024154589371980676
-0.024154589371980676 x 100 = -2.42%