-30.06% is the change from 509 to 356
Calculation steps:
[( 356 - 509 ) ÷ 509] x 100 = -30.06%
Formula
Percentage change = [(356 - 509) / 509] x 100
Subtract the new number by the original number
356 - 509 = -153
-153 ÷ 509 = -0.3005893909626719
-0.3005893909626719 x 100 = -30.06%