-31.56% is the change from 979 to 670
Calculation steps:
[( 670 - 979 ) ÷ 979] x 100 = -31.56%
Formula
Percentage change = [(670 - 979) / 979] x 100
Subtract the new number by the original number
670 - 979 = -309
-309 ÷ 979 = -0.31562819203268644
-0.31562819203268644 x 100 = -31.56%