-29.71% is the change from 939 to 660
Calculation steps:
[( 660 - 939 ) ÷ 939] x 100 = -29.71%
Formula
Percentage change = [(660 - 939) / 939] x 100
Subtract the new number by the original number
660 - 939 = -279
-279 ÷ 939 = -0.2971246006389776
-0.2971246006389776 x 100 = -29.71%