67.91% is the change from 321 to 539
Calculation steps:
[( 539 - 321 ) ÷ 321] x 100 = 67.91%
Formula
Percentage change = [(539 - 321) / 321] x 100
Subtract the new number by the original number
539 - 321 = 218
218 ÷ 321 = 0.6791277258566978
0.6791277258566978 x 100 = 67.91%