-23.25% is the change from 830 to 637
Calculation steps:
[( 637 - 830 ) ÷ 830] x 100 = -23.25%
Formula
Percentage change = [(637 - 830) / 830] x 100
Subtract the new number by the original number
637 - 830 = -193
-193 ÷ 830 = -0.2325301204819277
-0.2325301204819277 x 100 = -23.25%