-7.71% is the change from 545 to 503
Calculation steps:
[( 503 - 545 ) ÷ 545] x 100 = -7.71%
Formula
Percentage change = [(503 - 545) / 545] x 100
Subtract the new number by the original number
503 - 545 = -42
-42 ÷ 545 = -0.07706422018348624
-0.07706422018348624 x 100 = -7.71%