695.06% is the change from 81 to 644
Calculation steps:
[( 644 - 81 ) ÷ 81] x 100 = 695.06%
Formula
Percentage change = [(644 - 81) / 81] x 100
Subtract the new number by the original number
644 - 81 = 563
563 ÷ 81 = 6.950617283950617
6.950617283950617 x 100 = 695.06%