-18.92% is the change from 830 to 673
Calculation steps:
[( 673 - 830 ) ÷ 830] x 100 = -18.92%
Formula
Percentage change = [(673 - 830) / 830] x 100
Subtract the new number by the original number
673 - 830 = -157
-157 ÷ 830 = -0.1891566265060241
-0.1891566265060241 x 100 = -18.92%