479.53% is the change from 171 to 991
Calculation steps:
[( 991 - 171 ) ÷ 171] x 100 = 479.53%
Formula
Percentage change = [(991 - 171) / 171] x 100
Subtract the new number by the original number
991 - 171 = 820
820 ÷ 171 = 4.795321637426901
4.795321637426901 x 100 = 479.53%