-99.4% is the change from 669 to 4
Calculation steps:
[( 4 - 669 ) ÷ 669] x 100 = -99.4%
Formula
Percentage change = [(4 - 669) / 669] x 100
Subtract the new number by the original number
4 - 669 = -665
-665 ÷ 669 = -0.9940209267563528
-0.9940209267563528 x 100 = -99.4%