-9.38% is the change from 970 to 879
Calculation steps:
[( 879 - 970 ) ÷ 970] x 100 = -9.38%
Formula
Percentage change = [(879 - 970) / 970] x 100
Subtract the new number by the original number
879 - 970 = -91
-91 ÷ 970 = -0.09381443298969072
-0.09381443298969072 x 100 = -9.38%