-3.6% is the change from 861 to 830
Calculation steps:
[( 830 - 861 ) ÷ 861] x 100 = -3.6%
Formula
Percentage change = [(830 - 861) / 861] x 100
Subtract the new number by the original number
830 - 861 = -31
-31 ÷ 861 = -0.036004645760743324
-0.036004645760743324 x 100 = -3.6%