-36.85% is the change from 806 to 509
Calculation steps:
[( 509 - 806 ) ÷ 806] x 100 = -36.85%
Formula
Percentage change = [(509 - 806) / 806] x 100
Subtract the new number by the original number
509 - 806 = -297
-297 ÷ 806 = -0.3684863523573201
-0.3684863523573201 x 100 = -36.85%