-18.19% is the change from 830 to 679
Calculation steps:
[( 679 - 830 ) ÷ 830] x 100 = -18.19%
Formula
Percentage change = [(679 - 830) / 830] x 100
Subtract the new number by the original number
679 - 830 = -151
-151 ÷ 830 = -0.1819277108433735
-0.1819277108433735 x 100 = -18.19%