-70.73% is the change from 509 to 149
Calculation steps:
[( 149 - 509 ) ÷ 509] x 100 = -70.73%
Formula
Percentage change = [(149 - 509) / 509] x 100
Subtract the new number by the original number
149 - 509 = -360
-360 ÷ 509 = -0.7072691552062869
-0.7072691552062869 x 100 = -70.73%