-64.64% is the change from 509 to 180
Calculation steps:
[( 180 - 509 ) ÷ 509] x 100 = -64.64%
Formula
Percentage change = [(180 - 509) / 509] x 100
Subtract the new number by the original number
180 - 509 = -329
-329 ÷ 509 = -0.6463654223968566
-0.6463654223968566 x 100 = -64.64%