-17.59% is the change from 830 to 684
Calculation steps:
[( 684 - 830 ) ÷ 830] x 100 = -17.59%
Formula
Percentage change = [(684 - 830) / 830] x 100
Subtract the new number by the original number
684 - 830 = -146
-146 ÷ 830 = -0.17590361445783131
-0.17590361445783131 x 100 = -17.59%