-24.82% is the change from 830 to 624
Calculation steps:
[( 624 - 830 ) ÷ 830] x 100 = -24.82%
Formula
Percentage change = [(624 - 830) / 830] x 100
Subtract the new number by the original number
624 - 830 = -206
-206 ÷ 830 = -0.24819277108433735
-0.24819277108433735 x 100 = -24.82%