-0.31% is the change from 980 to 977
Calculation steps:
[( 977 - 980 ) ÷ 980] x 100 = -0.31%
Formula
Percentage change = [(977 - 980) / 980] x 100
Subtract the new number by the original number
977 - 980 = -3
-3 ÷ 980 = -0.003061224489795918
-0.003061224489795918 x 100 = -0.31%