31.09% is the change from 521 to 683
Calculation steps:
[( 683 - 521 ) ÷ 521] x 100 = 31.09%
Formula
Percentage change = [(683 - 521) / 521] x 100
Subtract the new number by the original number
683 - 521 = 162
162 ÷ 521 = 0.31094049904030713
0.31094049904030713 x 100 = 31.09%