-2.24% is the change from 849 to 830
Calculation steps:
[( 830 - 849 ) ÷ 849] x 100 = -2.24%
Formula
Percentage change = [(830 - 849) / 849] x 100
Subtract the new number by the original number
830 - 849 = -19
-19 ÷ 849 = -0.02237926972909305
-0.02237926972909305 x 100 = -2.24%