-81.11% is the change from 646 to 122
Calculation steps:
[( 122 - 646 ) ÷ 646] x 100 = -81.11%
Formula
Percentage change = [(122 - 646) / 646] x 100
Subtract the new number by the original number
122 - 646 = -524
-524 ÷ 646 = -0.8111455108359134
-0.8111455108359134 x 100 = -81.11%