33.78% is the change from 521 to 697
Calculation steps:
[( 697 - 521 ) ÷ 521] x 100 = 33.78%
Formula
Percentage change = [(697 - 521) / 521] x 100
Subtract the new number by the original number
697 - 521 = 176
176 ÷ 521 = 0.3378119001919386
0.3378119001919386 x 100 = 33.78%