-81.06% is the change from 644 to 122
Calculation steps:
[( 122 - 644 ) ÷ 644] x 100 = -81.06%
Formula
Percentage change = [(122 - 644) / 644] x 100
Subtract the new number by the original number
122 - 644 = -522
-522 ÷ 644 = -0.8105590062111802
-0.8105590062111802 x 100 = -81.06%