-15.6% is the change from 577 to 487
Calculation steps:
[( 487 - 577 ) ÷ 577] x 100 = -15.6%
Formula
Percentage change = [(487 - 577) / 577] x 100
Subtract the new number by the original number
487 - 577 = -90
-90 ÷ 577 = -0.1559792027729636
-0.1559792027729636 x 100 = -15.6%