-1.54% is the change from 843 to 830
Calculation steps:
[( 830 - 843 ) ÷ 843] x 100 = -1.54%
Formula
Percentage change = [(830 - 843) / 843] x 100
Subtract the new number by the original number
830 - 843 = -13
-13 ÷ 843 = -0.01542111506524318
-0.01542111506524318 x 100 = -1.54%