-70.53% is the change from 509 to 150
Calculation steps:
[( 150 - 509 ) ÷ 509] x 100 = -70.53%
Formula
Percentage change = [(150 - 509) / 509] x 100
Subtract the new number by the original number
150 - 509 = -359
-359 ÷ 509 = -0.7053045186640472
-0.7053045186640472 x 100 = -70.53%