-6.09% is the change from 542 to 509
Calculation steps:
[( 509 - 542 ) ÷ 542] x 100 = -6.09%
Formula
Percentage change = [(509 - 542) / 542] x 100
Subtract the new number by the original number
509 - 542 = -33
-33 ÷ 542 = -0.06088560885608856
-0.06088560885608856 x 100 = -6.09%