-5.1% is the change from 980 to 930
Calculation steps:
[( 930 - 980 ) ÷ 980] x 100 = -5.1%
Formula
Percentage change = [(930 - 980) / 980] x 100
Subtract the new number by the original number
930 - 980 = -50
-50 ÷ 980 = -0.05102040816326531
-0.05102040816326531 x 100 = -5.1%