-95.52% is the change from 669 to 30
Calculation steps:
[( 30 - 669 ) ÷ 669] x 100 = -95.52%
Formula
Percentage change = [(30 - 669) / 669] x 100
Subtract the new number by the original number
30 - 669 = -639
-639 ÷ 669 = -0.9551569506726457
-0.9551569506726457 x 100 = -95.52%