-6.3% is the change from 540 to 506
Calculation steps:
[( 506 - 540 ) ÷ 540] x 100 = -6.3%
Formula
Percentage change = [(506 - 540) / 540] x 100
Subtract the new number by the original number
506 - 540 = -34
-34 ÷ 540 = -0.06296296296296296
-0.06296296296296296 x 100 = -6.3%