69.57% is the change from 391 to 663
Calculation steps:
[( 663 - 391 ) ÷ 391] x 100 = 69.57%
Formula
Percentage change = [(663 - 391) / 391] x 100
Subtract the new number by the original number
663 - 391 = 272
272 ÷ 391 = 0.6956521739130435
0.6956521739130435 x 100 = 69.57%