-18.12% is the change from 839 to 687
Calculation steps:
[( 687 - 839 ) ÷ 839] x 100 = -18.12%
Formula
Percentage change = [(687 - 839) / 839] x 100
Subtract the new number by the original number
687 - 839 = -152
-152 ÷ 839 = -0.18116805721096543
-0.18116805721096543 x 100 = -18.12%