719.75% is the change from 81 to 664
Calculation steps:
[( 664 - 81 ) ÷ 81] x 100 = 719.75%
Formula
Percentage change = [(664 - 81) / 81] x 100
Subtract the new number by the original number
664 - 81 = 583
583 ÷ 81 = 7.197530864197531
7.197530864197531 x 100 = 719.75%