663.86% is the change from 83 to 634
Calculation steps:
[( 634 - 83 ) ÷ 83] x 100 = 663.86%
Formula
Percentage change = [(634 - 83) / 83] x 100
Subtract the new number by the original number
634 - 83 = 551
551 ÷ 83 = 6.63855421686747
6.63855421686747 x 100 = 663.86%