66.45% is the change from 313 to 521
Calculation steps:
[( 521 - 313 ) ÷ 313] x 100 = 66.45%
Formula
Percentage change = [(521 - 313) / 313] x 100
Subtract the new number by the original number
521 - 313 = 208
208 ÷ 313 = 0.6645367412140575
0.6645367412140575 x 100 = 66.45%