-83.54% is the change from 401 to 66
Calculation steps:
[( 66 - 401 ) ÷ 401] x 100 = -83.54%
Formula
Percentage change = [(66 - 401) / 401] x 100
Subtract the new number by the original number
66 - 401 = -335
-335 ÷ 401 = -0.8354114713216958
-0.8354114713216958 x 100 = -83.54%