-73.67% is the change from 509 to 134
Calculation steps:
[( 134 - 509 ) ÷ 509] x 100 = -73.67%
Formula
Percentage change = [(134 - 509) / 509] x 100
Subtract the new number by the original number
134 - 509 = -375
-375 ÷ 509 = -0.7367387033398821
-0.7367387033398821 x 100 = -73.67%