-59.54% is the change from 991 to 401
Calculation steps:
[( 401 - 991 ) ÷ 991] x 100 = -59.54%
Formula
Percentage change = [(401 - 991) / 991] x 100
Subtract the new number by the original number
401 - 991 = -590
-590 ÷ 991 = -0.5953582240161454
-0.5953582240161454 x 100 = -59.54%