-58.06% is the change from 999 to 419
Calculation steps:
[( 419 - 999 ) ÷ 999] x 100 = -58.06%
Formula
Percentage change = [(419 - 999) / 999] x 100
Subtract the new number by the original number
419 - 999 = -580
-580 ÷ 999 = -0.5805805805805806
-0.5805805805805806 x 100 = -58.06%