91.36% is the change from 521 to 997
Calculation steps:
[( 997 - 521 ) ÷ 521] x 100 = 91.36%
Formula
Percentage change = [(997 - 521) / 521] x 100
Subtract the new number by the original number
997 - 521 = 476
476 ÷ 521 = 0.9136276391554703
0.9136276391554703 x 100 = 91.36%