-42.48% is the change from 991 to 570
Calculation steps:
[( 570 - 991 ) ÷ 991] x 100 = -42.48%
Formula
Percentage change = [(570 - 991) / 991] x 100
Subtract the new number by the original number
570 - 991 = -421
-421 ÷ 991 = -0.4248234106962664
-0.4248234106962664 x 100 = -42.48%