-18.95% is the change from 839 to 680
Calculation steps:
[( 680 - 839 ) ÷ 839] x 100 = -18.95%
Formula
Percentage change = [(680 - 839) / 839] x 100
Subtract the new number by the original number
680 - 839 = -159
-159 ÷ 839 = -0.18951132300357568
-0.18951132300357568 x 100 = -18.95%