91.68% is the change from 517 to 991
Calculation steps:
[( 991 - 517 ) ÷ 517] x 100 = 91.68%
Formula
Percentage change = [(991 - 517) / 517] x 100
Subtract the new number by the original number
991 - 517 = 474
474 ÷ 517 = 0.9168278529980658
0.9168278529980658 x 100 = 91.68%