91.16% is the change from 509 to 973
Calculation steps:
[( 973 - 509 ) ÷ 509] x 100 = 91.16%
Formula
Percentage change = [(973 - 509) / 509] x 100
Subtract the new number by the original number
973 - 509 = 464
464 ÷ 509 = 0.9115913555992141
0.9115913555992141 x 100 = 91.16%