117.8% is the change from 455 to 991
Calculation steps:
[( 991 - 455 ) ÷ 455] x 100 = 117.8%
Formula
Percentage change = [(991 - 455) / 455] x 100
Subtract the new number by the original number
991 - 455 = 536
536 ÷ 455 = 1.178021978021978
1.178021978021978 x 100 = 117.8%