-59.13% is the change from 991 to 405
Calculation steps:
[( 405 - 991 ) ÷ 991] x 100 = -59.13%
Formula
Percentage change = [(405 - 991) / 991] x 100
Subtract the new number by the original number
405 - 991 = -586
-586 ÷ 991 = -0.591321897073663
-0.591321897073663 x 100 = -59.13%