-98.3% is the change from 646 to 11
Calculation steps:
[( 11 - 646 ) ÷ 646] x 100 = -98.3%
Formula
Percentage change = [(11 - 646) / 646] x 100
Subtract the new number by the original number
11 - 646 = -635
-635 ÷ 646 = -0.9829721362229102
-0.9829721362229102 x 100 = -98.3%