-17.23% is the change from 830 to 687
Calculation steps:
[( 687 - 830 ) ÷ 830] x 100 = -17.23%
Formula
Percentage change = [(687 - 830) / 830] x 100
Subtract the new number by the original number
687 - 830 = -143
-143 ÷ 830 = -0.172289156626506
-0.172289156626506 x 100 = -17.23%