500.6% is the change from 166 to 997
Calculation steps:
[( 997 - 166 ) ÷ 166] x 100 = 500.6%
Formula
Percentage change = [(997 - 166) / 166] x 100
Subtract the new number by the original number
997 - 166 = 831
831 ÷ 166 = 5.006024096385542
5.006024096385542 x 100 = 500.6%