-59.03% is the change from 991 to 406
Calculation steps:
[( 406 - 991 ) ÷ 991] x 100 = -59.03%
Formula
Percentage change = [(406 - 991) / 991] x 100
Subtract the new number by the original number
406 - 991 = -585
-585 ÷ 991 = -0.5903128153380424
-0.5903128153380424 x 100 = -59.03%