-8.06% is the change from 620 to 570
Calculation steps:
[( 570 - 620 ) ÷ 620] x 100 = -8.06%
Formula
Percentage change = [(570 - 620) / 620] x 100
Subtract the new number by the original number
570 - 620 = -50
-50 ÷ 620 = -0.08064516129032258
-0.08064516129032258 x 100 = -8.06%