-19.04% is the change from 830 to 672
Calculation steps:
[( 672 - 830 ) ÷ 830] x 100 = -19.04%
Formula
Percentage change = [(672 - 830) / 830] x 100
Subtract the new number by the original number
672 - 830 = -158
-158 ÷ 830 = -0.19036144578313252
-0.19036144578313252 x 100 = -19.04%