-36.6% is the change from 817 to 518
Calculation steps:
[( 518 - 817 ) ÷ 817] x 100 = -36.6%
Formula
Percentage change = [(518 - 817) / 817] x 100
Subtract the new number by the original number
518 - 817 = -299
-299 ÷ 817 = -0.3659730722154223
-0.3659730722154223 x 100 = -36.6%