-17.98% is the change from 506 to 415
Calculation steps:
[( 415 - 506 ) ÷ 506] x 100 = -17.98%
Formula
Percentage change = [(415 - 506) / 506] x 100
Subtract the new number by the original number
415 - 506 = -91
-91 ÷ 506 = -0.17984189723320157
-0.17984189723320157 x 100 = -17.98%