-23.69% is the change from 667 to 509
Calculation steps:
[( 509 - 667 ) ÷ 667] x 100 = -23.69%
Formula
Percentage change = [(509 - 667) / 667] x 100
Subtract the new number by the original number
509 - 667 = -158
-158 ÷ 667 = -0.2368815592203898
-0.2368815592203898 x 100 = -23.69%