-2.15% is the change from 930 to 910
Calculation steps:
[( 910 - 930 ) ÷ 930] x 100 = -2.15%
Formula
Percentage change = [(910 - 930) / 930] x 100
Subtract the new number by the original number
910 - 930 = -20
-20 ÷ 930 = -0.021505376344086023
-0.021505376344086023 x 100 = -2.15%