-99.4% is the change from 662 to 4
Calculation steps:
[( 4 - 662 ) ÷ 662] x 100 = -99.4%
Formula
Percentage change = [(4 - 662) / 662] x 100
Subtract the new number by the original number
4 - 662 = -658
-658 ÷ 662 = -0.9939577039274925
-0.9939577039274925 x 100 = -99.4%