-30.7% is the change from 837 to 580
Calculation steps:
[( 580 - 837 ) ÷ 837] x 100 = -30.7%
Formula
Percentage change = [(580 - 837) / 837] x 100
Subtract the new number by the original number
580 - 837 = -257
-257 ÷ 837 = -0.3070489844683393
-0.3070489844683393 x 100 = -30.7%