-16.87% is the change from 830 to 690
Calculation steps:
[( 690 - 830 ) ÷ 830] x 100 = -16.87%
Formula
Percentage change = [(690 - 830) / 830] x 100
Subtract the new number by the original number
690 - 830 = -140
-140 ÷ 830 = -0.1686746987951807
-0.1686746987951807 x 100 = -16.87%